Provided by: sysstat_12.0.1-1_amd64 bug

NAME

       sar - Collect, report, or save system activity information.

SYNOPSIS

       sar [ -A ] [ -B ] [ -b ] [ -C ] [ -D ] [ -d ] [ -F [ MOUNT ] ] [ -H ] [ -h ] [ -p ] [ -q ]
       [ -r [ ALL ] ] [ -S ] [ -t ] [ -u [ ALL ] ] [ -V ] [ -v ] [ -W ] [ -w ] [ -y ] [  -z  ]  [
       --dec={  0  |  1  |  2  } ] [ --dev= dev_list ] [ --fs= fs_list ] [ --help ] [ --human ] [
       --iface= iface_list ] [ --sadc ] [ -I { int_list | SUM | ALL } ] [ -P { cpu_list | ALL } ]
       [ -m { keyword [,...] | ALL } ] [ -n { keyword [,...] | ALL } ] [ -j { ID | LABEL | PATH |
       UUID | ... } ] [ -f [ filename ] | -o [ filename ] | -[0-9]+ ] [ -i  interval  ]  [  -s  [
       hh:mm[:ss] ] ] [ -e [ hh:mm[:ss] ] ] [ interval [ count ] ]

DESCRIPTION

       The  sar  command  writes  to standard output the contents of selected cumulative activity
       counters in the operating system. The accounting system, based on the values in the  count
       and  interval  parameters,  writes information the specified number of times spaced at the
       specified intervals in seconds.  If the interval parameter is set to zero, the sar command
       displays the average statistics for the time since the system was started. If the interval
       parameter  is  specified  without  the  count  parameter,  then  reports   are   generated
       continuously.   The  collected  data  can  also  be  saved in the file specified by the -o
       filename flag, in addition to being displayed onto the screen. If filename is omitted, sar
       uses  the  standard  system activity daily data file (see below).  By default all the data
       available from the kernel are saved in the data file.

       The sar command extracts and writes to standard output records previously saved in a file.
       This  file  can  be  either  the one specified by the -f flag or, by default, the standard
       system activity daily data file.  It is also possible to enter -1, -2 etc. as an  argument
       to sar to display data of that days ago. For example, -1 will point at the standard system
       activity file of yesterday.

       Standard system activity daily data files are named saDD or saYYYYMMDD, where YYYY  stands
       for  the  current  year, MM for the current month and DD for the current day. They are the
       default files used by sar only when no filename has been explicitly specified.  When  used
       to write data to files (with its option -o), sar will use saYYYYMMDD if option -D has also
       been specified, else it will use saDD.  When used to display the records previously  saved
       in a file, sar will look for the most recent of saDD and saYYYYMMDD, and use it.

       Standard system activity daily data files are located in the /var/log/sysstat directory by
       default. Yet it is possible to specify an alternate location  for  them:  If  a  directory
       (instead  of a plain file) is used with options -f or -o then it will be considered as the
       directory containing the data files.

       Without the -P flag, the sar command reports system-wide  (global  among  all  processors)
       statistics,  which  are calculated as averages for values expressed as percentages, and as
       sums otherwise. If the -P flag is given, the sar command reports activity which relates to
       the  specified  processor  or  processors.  If  -P  ALL  is given, the sar command reports
       statistics for each individual processor  and  global  statistics  among  all  processors.
       Offline processors are not displayed.

       You  can  select  information about specific system activities using flags. Not specifying
       any flags selects only  CPU  activity.   Specifying  the  -A  flag  selects  all  possible
       activities.

       The  default version of the sar command (CPU utilization report) might be one of the first
       facilities the user runs to begin system activity investigation, because it monitors major
       system  resources.  If  CPU  utilization  is  near 100 percent (user + nice + system), the
       workload sampled is CPU-bound.

       If multiple samples and multiple reports are desired,  it  is  convenient  to  specify  an
       output  file for the sar command.  Run the sar command as a background process. The syntax
       for this is:

       sar -o datafile interval count >/dev/null 2>&1 &

       All data are captured in binary form and saved to a file (datafile).  The data can then be
       selectively displayed with the sar command using the -f option. Set the interval and count
       parameters to select count records at interval second intervals. If the count parameter is
       not  set,  all the records saved in the file will be selected.  Collection of data in this
       manner is useful to characterize system usage over a period of  time  and  determine  peak
       usage hours.

       Note:     The sar command only reports on local activities.

OPTIONS

       -A     This  is  equivalent to specifying -bBdFHqSuvwWy -I SUM -I ALL -m ALL -n ALL -r ALL
              -u ALL -P ALL.

       -B     Report paging statistics.  The following values are displayed:

              pgpgin/s
                     Total number of kilobytes the system paged in from disk per second.

              pgpgout/s
                     Total number of kilobytes the system paged out to disk per second.

              fault/s
                     Number of page faults (major + minor) made by the system per  second.   This
                     is  not  a  count of page faults that generate I/O, because some page faults
                     can be resolved without I/O.

              majflt/s
                     Number of major faults the system has made  per  second,  those  which  have
                     required loading a memory page from disk.

              pgfree/s
                     Number of pages placed on the free list by the system per second.

              pgscank/s
                     Number of pages scanned by the kswapd daemon per second.

              pgscand/s
                     Number of pages scanned directly per second.

              pgsteal/s
                     Number  of  pages  the  system  has  reclaimed  from  cache  (pagecache  and
                     swapcache) per second to satisfy its memory demands.

              %vmeff
                     Calculated as pgsteal / pgscan, this is a metric of the efficiency  of  page
                     reclaim.  If  it  is near 100% then almost every page coming off the tail of
                     the inactive list is being reaped. If it gets too low (e.g. less  than  30%)
                     then  the virtual memory is having some difficulty.  This field is displayed
                     as zero if no pages have been scanned during the interval of time.

       -b     Report I/O and transfer rate statistics.  The following values are displayed:

              tps
                     Total number of transfers per second that were issued to  physical  devices.
                     A transfer is an I/O request to a physical device. Multiple logical requests
                     can be combined into a single I/O request to the device.  A transfer  is  of
                     indeterminate size.

              rtps
                     Total number of read requests per second issued to physical devices.

              wtps
                     Total number of write requests per second issued to physical devices.

              bread/s
                     Total amount of data read from the devices in blocks per second.  Blocks are
                     equivalent to sectors and therefore have a size of 512 bytes.

              bwrtn/s
                     Total amount of data written to devices in blocks per second.

       -C     When reading data from a file, tell sar to display comments that have been inserted
              by sadc.

       -D     Use  saYYYYMMDD  instead  of  saDD  as the standard system activity daily data file
              name. This option works only when used in conjunction with option -o to  save  data
              to file.

       -d     Report  activity  for  each  block  device.   When  data  are displayed, the device
              specification devM-n is generally used (DEV column).  M is the major number of  the
              device  and  n its minor number.  Device names may also be pretty-printed if option
              -p is used or persistent device names can be printed if  option  -j  is  used  (see
              below).  Statistics  for  all  devices  are  displayed  unless a restricted list is
              specified using option --dev= (see corresponding option  entry).   Note  that  disk
              activity  depends  on  sadc  options  -S  DISK  and  -S  XDISK to be collected. The
              following values are displayed:

              tps
                     Total number of transfers per second that were issued to  physical  devices.
                     A transfer is an I/O request to a physical device. Multiple logical requests
                     can be combined into a single I/O request to the device.  A transfer  is  of
                     indeterminate size.

              rkB/s
                     Number of kilobytes read from the device per second.

              wkB/s
                     Number of kilobytes written to the device per second.

              areq-sz
                     The  average size (in kilobytes) of the I/O requests that were issued to the
                     device.
                     Note: In previous versions,  this  field  was  known  as  avgrq-sz  and  was
                     expressed in sectors.

              aqu-sz
                     The average queue length of the requests that were issued to the device.
                     Note: In previous versions, this field was known as avgqu-sz.

              await
                     The  average time (in milliseconds) for I/O requests issued to the device to
                     be served. This includes the time spent by the requests  in  queue  and  the
                     time spent servicing them.

              svctm
                     The average service time (in milliseconds) for I/O requests that were issued
                     to the device. Warning! Do not trust this field any more. This field will be
                     removed in a future sysstat version.

              %util
                     Percentage  of  elapsed  time  during  which I/O requests were issued to the
                     device (bandwidth utilization for the device). Device saturation occurs when
                     this  value  is close to 100% for devices serving requests serially. But for
                     devices serving requests in parallel, such as RAID arrays and  modern  SSDs,
                     this number does not reflect their performance limits.

       --dec={ 0 | 1 | 2 }
              Specify the number of decimal places to use (0 to 2, default value is 2).

       --dev=dev_list
              Specify  the  block  devices  for  which  statistics  are  to  be displayed by sar.
              dev_list is a list of comma-separated device names.

       -e [ hh:mm[:ss] ]
              Set the ending time of the report. The default ending time is 18:00:00. Hours  must
              be  given  in  24-hour  format.  This option can be used when data are read from or
              written to a file (options -f or -o).

       -F [ MOUNT ]
              Display  statistics  for  currently  mounted  filesystems.  Pseudo-filesystems  are
              ignored.  At  the  end  of  the  report,  sar  will  display a summary of all those
              filesystems.  Use of the MOUNT parameter keyword indicates that mountpoint will  be
              reported instead of filesystem device. Statistics for all filesystems are displayed
              unless a restricted list is specified using option --fs= (see corresponding  option
              entry).   Note  that  filesystems  statistics  depend on sadc option -S XDISK to be
              collected.

              The following values are displayed:

              MBfsfree
                     Total amount a free space in megabytes (including space  available  only  to
                     privileged user).

              MBfsused
                     Total amount of space used in megabytes.

              %fsused
                     Percentage of filesystem space used, as seen by a privileged user.

              %ufsused
                     Percentage of filesystem space used, as seen by an unprivileged user.

              Ifree
                     Total number of free file nodes in filesystem.

              Iused
                     Total number of file nodes used in filesystem.

              %Iused
                     Percentage of file nodes used in filesystem.

       -f [ filename ]
              Extract  records from filename (created by the -o filename flag). The default value
              of the filename parameter is the current standard system activity daily data  file.
              If  filename  is  a  directory instead of a plain file then it is considered as the
              directory where the standard system activity daily data files are located.  The  -f
              option is exclusive of the -o option.

       --fs=fs_list
              Specify  the  filesystems for which statistics are to be displayed by sar.  fs_list
              is a list of comma-separated filesystem names or mountpoints.

       -H     Report hugepages utilization statistics.  The following values are displayed:

              kbhugfree
                     Amount of hugepages memory in kilobytes that is not yet allocated.

              kbhugused
                     Amount of hugepages memory in kilobytes that has been allocated.

              %hugused
                     Percentage of total hugepages memory that has been allocated.

       -h     Make the output of  sar  easier  to  read  by  a  human.  Options  --human  and  -p
              (pretty-print)  are  enabled  implicitly  with  this  option.   This  option may be
              especially useful  when  displaying  e.g.,  network  interfaces  or  block  devices
              statistics.

       --help Display a short help message then exit.

       --human
              Print  sizes  in human readable format (e.g. 1.0k, 1.2M, etc.)  The units displayed
              with this option supersede any other default units  (e.g.   kilobytes,  sectors...)
              associated with the metrics.

       -I { int_list | SUM | ALL }
              Report  statistics for interrupts.  int_list is a list of comma-separated values or
              range of values (e.g., 0-16,35,400-).  The SUM keyword  indicates  that  the  total
              number  of  interrupts  received  per  second  is  to be displayed. The ALL keyword
              indicates that statistics from all interrupts, including potential  APIC  interrupt
              sources,  are to be reported.  Note that interrupt statistics depend on sadc option
              "-S INT" to be collected.

       -i interval
              Select data records at seconds as close as possible to the number specified by  the
              interval parameter.

       --iface=iface_list
              Specify  the  network  interfaces  for which statistics are to be displayed by sar.
              iface_list is a list of comma-separated interface names.

       -j { ID | LABEL | PATH | UUID | ... }
              Display persistent device names. Use this option in  conjunction  with  option  -d.
              Options  ID, LABEL, etc. specify the type of the persistent name. These options are
              not limited, only prerequisite is that directory with required persistent names  is
              present  in  /dev/disk.  If persistent name is not found for the device, the device
              name is pretty-printed (see option -p below).

       -m { keyword [,...] | ALL }
              Report power management statistics.  Note that these statistics  depend  on  sadc's
              option "-S POWER" to be collected.

              Possible keywords are CPU, FAN, FREQ, IN, TEMP and USB.

              With  the  CPU  keyword, statistics about CPU are reported.  The following value is
              displayed:

              MHz
                     Instantaneous CPU clock frequency in MHz.

              With the FAN keyword, statistics about fans  speed  are  reported.   The  following
              values are displayed:

              rpm
                     Fan speed expressed in revolutions per minute.

              drpm
                     This  field  is calculated as the difference between current fan speed (rpm)
                     and its low limit (fan_min).

              DEVICE
                     Sensor device name.

              With the FREQ keyword, statistics about CPU  clock  frequency  are  reported.   The
              following value is displayed:

              wghMHz
                     Weighted  average  CPU  clock frequency in MHz.  Note that the cpufreq-stats
                     driver must be compiled in the kernel for this option to work.

              With the IN keyword, statistics about voltage inputs are reported.   The  following
              values are displayed:

              inV
                     Voltage input expressed in Volts.

              %in
                     Relative  input  value. A value of 100% means that voltage input has reached
                     its high limit (in_max) whereas a value of 0% means that it has reached  its
                     low limit (in_min).

              DEVICE
                     Sensor device name.

              With  the  TEMP  keyword,  statistics  about devices temperature are reported.  The
              following values are displayed:

              degC
                     Device temperature expressed in degrees Celsius.

              %temp
                     Relative device temperature. A value of  100%  means  that  temperature  has
                     reached its high limit (temp_max).

              DEVICE
                     Sensor device name.

              With  the  USB  keyword,  the  sar  command takes a snapshot of all the USB devices
              currently plugged into the system. At the end of the report,  sar  will  display  a
              summary of all those USB devices.  The following values are displayed:

              BUS
                     Root hub number of the USB device.

              idvendor
                     Vendor ID number (assigned by USB organization).

              idprod
                     Product ID number (assigned by Manufacturer).

              maxpower
                     Maximum power consumption of the device (expressed in mA).

              manufact
                     Manufacturer name.

              product
                     Product name.

              The  ALL  keyword  is equivalent to specifying all the keywords above and therefore
              all the power management statistics are reported.

       -n { keyword [,...] | ALL }
              Report network statistics.

              Possible keywords are DEV, EDEV, FC, ICMP, EICMP,  ICMP6,  EICMP6,  IP,  EIP,  IP6,
              EIP6, NFS, NFSD, SOCK, SOCK6, SOFT, TCP, ETCP, UDP and UDP6.

              With the DEV keyword, statistics from the network devices are reported.  Statistics
              for all network interfaces are displayed unless  a  restricted  list  is  specified
              using  option  --iface= (see corresponding option entry).  The following values are
              displayed:

              IFACE
                     Name of the network interface for which statistics are reported.

              rxpck/s
                     Total number of packets received per second.

              txpck/s
                     Total number of packets transmitted per second.

              rxkB/s
                     Total number of kilobytes received per second.

              txkB/s
                     Total number of kilobytes transmitted per second.

              rxcmp/s
                     Number of compressed packets received per second (for cslip etc.).

              txcmp/s
                     Number of compressed packets transmitted per second.

              rxmcst/s
                     Number of multicast packets received per second.

              %ifutil
                     Utilization percentage of the network interface. For half-duplex interfaces,
                     utilization is calculated using the sum of rxkB/s and txkB/s as a percentage
                     of the interface speed. For full-duplex, this is the greater  of  rxkB/S  or
                     txkB/s.

              With the EDEV keyword, statistics on failures (errors) from the network devices are
              reported.  Statistics for all network interfaces are displayed unless a  restricted
              list  is  specified  using  option  --iface= (see corresponding option entry).  The
              following values are displayed:

              IFACE
                     Name of the network interface for which statistics are reported.

              rxerr/s
                     Total number of bad packets received per second.

              txerr/s
                     Total number of errors that happened per second while transmitting packets.

              coll/s
                     Number of collisions that happened per second while transmitting packets.

              rxdrop/s
                     Number of received packets dropped per second because of a lack of space  in
                     linux buffers.

              txdrop/s
                     Number  of transmitted packets dropped per second because of a lack of space
                     in linux buffers.

              txcarr/s
                     Number  of  carrier-errors  that  happened  per  second  while  transmitting
                     packets.

              rxfram/s
                     Number  of  frame  alignment  errors  that  happened  per second on received
                     packets.

              rxfifo/s
                     Number of FIFO overrun errors that happened per second on received packets.

              txfifo/s
                     Number of FIFO overrun  errors  that  happened  per  second  on  transmitted
                     packets.

              With  the  FC  keyword,  statistics about fibre channel traffic are reported.  Note
              that fibre channel statistics depend on sadc's option "-S DISK"  to  be  collected.
              The following values are displayed:

              FCHOST
                     Name  of  the  fibre  channel  host  bus  adapter  (HBA) interface for which
                     statistics are reported.

              fch_rxf/s
                     The total number of frames received per second.

              fch_txf/s
                     The total number of frames transmitted per second.

              fch_rxw/s
                     The total number of transmission words received per second.

              fch_txw/s
                     The total number of transmission words transmitted per second.

              With the ICMP keyword, statistics about ICMPv4 network traffic are reported.   Note
              that  ICMPv4  statistics  depend  on  sadc's option "-S SNMP" to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              imsg/s
                     The total number of ICMP messages  which  the  entity  received  per  second
                     [icmpInMsgs].  Note that this counter includes all those counted by ierr/s.

              omsg/s
                     The  total  number  of ICMP messages which this entity attempted to send per
                     second [icmpOutMsgs].  Note that this counter includes all those counted  by
                     oerr/s.

              iech/s
                     The   number   of   ICMP   Echo   (request)  messages  received  per  second
                     [icmpInEchos].

              iechr/s
                     The number of ICMP Echo Reply messages received per second [icmpInEchoReps].

              oech/s
                     The number of ICMP Echo (request) messages sent per second [icmpOutEchos].

              oechr/s
                     The number of ICMP Echo Reply messages sent per second [icmpOutEchoReps].

              itm/s
                     The  number  of  ICMP  Timestamp  (request)  messages  received  per  second
                     [icmpInTimestamps].

              itmr/s
                     The   number   of   ICMP   Timestamp  Reply  messages  received  per  second
                     [icmpInTimestampReps].

              otm/s
                     The  number  of  ICMP  Timestamp  (request)   messages   sent   per   second
                     [icmpOutTimestamps].

              otmr/s
                     The   number   of   ICMP   Timestamp   Reply   messages   sent   per  second
                     [icmpOutTimestampReps].

              iadrmk/s
                     The number of  ICMP  Address  Mask  Request  messages  received  per  second
                     [icmpInAddrMasks].

              iadrmkr/s
                     The  number  of  ICMP  Address  Mask  Reply  messages  received  per  second
                     [icmpInAddrMaskReps].

              oadrmk/s
                     The  number  of  ICMP  Address  Mask  Request  messages  sent   per   second
                     [icmpOutAddrMasks].

              oadrmkr/s
                     The   number   of   ICMP   Address  Mask  Reply  messages  sent  per  second
                     [icmpOutAddrMaskReps].

              With the EICMP keyword, statistics about ICMPv4 error messages are reported.   Note
              that  ICMPv4  statistics  depend  on  sadc's option "-S SNMP" to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              ierr/s
                     The number of ICMP  messages  per  second  which  the  entity  received  but
                     determined  as  having ICMP-specific errors (bad ICMP checksums, bad length,
                     etc.) [icmpInErrors].

              oerr/s
                     The number of ICMP messages per second which this entity did not send due to
                     problems discovered within ICMP such as a lack of buffers [icmpOutErrors].

              idstunr/s
                     The  number  of  ICMP  Destination  Unreachable messages received per second
                     [icmpInDestUnreachs].

              odstunr/s
                     The  number  of  ICMP  Destination  Unreachable  messages  sent  per  second
                     [icmpOutDestUnreachs].

              itmex/s
                     The   number   of   ICMP   Time   Exceeded   messages  received  per  second
                     [icmpInTimeExcds].

              otmex/s
                     The   number   of   ICMP   Time   Exceeded   messages   sent   per    second
                     [icmpOutTimeExcds].

              iparmpb/s
                     The   number   of  ICMP  Parameter  Problem  messages  received  per  second
                     [icmpInParmProbs].

              oparmpb/s
                     The  number  of  ICMP   Parameter   Problem   messages   sent   per   second
                     [icmpOutParmProbs].

              isrcq/s
                     The   number   of   ICMP   Source   Quench   messages  received  per  second
                     [icmpInSrcQuenchs].

              osrcq/s
                     The   number   of   ICMP   Source   Quench   messages   sent   per    second
                     [icmpOutSrcQuenchs].

              iredir/s
                     The number of ICMP Redirect messages received per second [icmpInRedirects].

              oredir/s
                     The number of ICMP Redirect messages sent per second [icmpOutRedirects].

              With the ICMP6 keyword, statistics about ICMPv6 network traffic are reported.  Note
              that ICMPv6 statistics depend on sadc's option "-S  IPV6"  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              imsg6/s
                     The total number of ICMP messages received by the interface per second which
                     includes all those counted by ierr6/s [ipv6IfIcmpInMsgs].

              omsg6/s
                     The total number of ICMP messages which this interface attempted to send per
                     second [ipv6IfIcmpOutMsgs].

              iech6/s
                     The  number  of  ICMP  Echo (request) messages received by the interface per
                     second [ipv6IfIcmpInEchos].

              iechr6/s
                     The number of ICMP Echo Reply messages received by the interface per  second
                     [ipv6IfIcmpInEchoReplies].

              oechr6/s
                     The  number  of  ICMP  Echo  Reply messages sent by the interface per second
                     [ipv6IfIcmpOutEchoReplies].

              igmbq6/s
                     The number of  ICMPv6  Group  Membership  Query  messages  received  by  the
                     interface per second [ipv6IfIcmpInGroupMembQueries].

              igmbr6/s
                     The  number  of  ICMPv6  Group  Membership Response messages received by the
                     interface per second [ipv6IfIcmpInGroupMembResponses].

              ogmbr6/s
                     The number of ICMPv6 Group Membership  Response  messages  sent  per  second
                     [ipv6IfIcmpOutGroupMembResponses].

              igmbrd6/s
                     The  number  of  ICMPv6  Group Membership Reduction messages received by the
                     interface per second [ipv6IfIcmpInGroupMembReductions].

              ogmbrd6/s
                     The number of ICMPv6 Group Membership Reduction  messages  sent  per  second
                     [ipv6IfIcmpOutGroupMembReductions].

              irtsol6/s
                     The  number  of  ICMP  Router Solicit messages received by the interface per
                     second [ipv6IfIcmpInRouterSolicits].

              ortsol6/s
                     The number of ICMP Router Solicitation messages sent by  the  interface  per
                     second [ipv6IfIcmpOutRouterSolicits].

              irtad6/s
                     The  number  of ICMP Router Advertisement messages received by the interface
                     per second [ipv6IfIcmpInRouterAdvertisements].

              inbsol6/s
                     The number of ICMP Neighbor Solicit messages received by the  interface  per
                     second [ipv6IfIcmpInNeighborSolicits].

              onbsol6/s
                     The  number of ICMP Neighbor Solicitation messages sent by the interface per
                     second [ipv6IfIcmpOutNeighborSolicits].

              inbad6/s
                     The number of ICMP Neighbor Advertisement messages received by the interface
                     per second [ipv6IfIcmpInNeighborAdvertisements].

              onbad6/s
                     The number of ICMP Neighbor Advertisement messages sent by the interface per
                     second [ipv6IfIcmpOutNeighborAdvertisements].

              With the EICMP6 keyword, statistics about ICMPv6 error messages are reported.  Note
              that  ICMPv6  statistics  depend  on  sadc's option "-S IPV6" to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              ierr6/s
                     The number of ICMP messages per second  which  the  interface  received  but
                     determined  as  having ICMP-specific errors (bad ICMP checksums, bad length,
                     etc.)  [ipv6IfIcmpInErrors]

              idtunr6/s
                     The  number  of  ICMP  Destination  Unreachable  messages  received  by  the
                     interface per second [ipv6IfIcmpInDestUnreachs].

              odtunr6/s
                     The  number  of  ICMP Destination Unreachable messages sent by the interface
                     per second [ipv6IfIcmpOutDestUnreachs].

              itmex6/s
                     The number of ICMP Time Exceeded messages  received  by  the  interface  per
                     second [ipv6IfIcmpInTimeExcds].

              otmex6/s
                     The  number  of ICMP Time Exceeded messages sent by the interface per second
                     [ipv6IfIcmpOutTimeExcds].

              iprmpb6/s
                     The number of ICMP Parameter Problem messages received by the interface  per
                     second [ipv6IfIcmpInParmProblems].

              oprmpb6/s
                     The  number  of  ICMP  Parameter  Problem messages sent by the interface per
                     second [ipv6IfIcmpOutParmProblems].

              iredir6/s
                     The number of  Redirect  messages  received  by  the  interface  per  second
                     [ipv6IfIcmpInRedirects].

              oredir6/s
                     The   number   of   Redirect  messages  sent  by  the  interface  by  second
                     [ipv6IfIcmpOutRedirects].

              ipck2b6/s
                     The number of ICMP Packet Too Big messages received  by  the  interface  per
                     second [ipv6IfIcmpInPktTooBigs].

              opck2b6/s
                     The  number of ICMP Packet Too Big messages sent by the interface per second
                     [ipv6IfIcmpOutPktTooBigs].

              With the IP keyword, statistics about IPv4 network traffic are reported.  Note that
              IPv4  statistics  depend on sadc's option "-S SNMP" to be collected.  The following
              values are displayed (formal SNMP names between square brackets):

              irec/s
                     The total number of input datagrams received  from  interfaces  per  second,
                     including those received in error [ipInReceives].

              fwddgm/s
                     The  number  of  input  datagrams  per second, for which this entity was not
                     their final IP destination, as a result of which an attempt was made to find
                     a route to forward them to that final destination [ipForwDatagrams].

              idel/s
                     The  total number of input datagrams successfully delivered per second to IP
                     user-protocols (including ICMP) [ipInDelivers].

              orq/s
                     The total number of IP datagrams which local  IP  user-protocols  (including
                     ICMP)   supplied   per   second   to   IP   in   requests  for  transmission
                     [ipOutRequests].  Note that this counter  does  not  include  any  datagrams
                     counted in fwddgm/s.

              asmrq/s
                     The  number  of  IP  fragments  received  per  second  which  needed  to  be
                     reassembled at this entity [ipReasmReqds].

              asmok/s
                     The  number  of  IP   datagrams   successfully   re-assembled   per   second
                     [ipReasmOKs].

              fragok/s
                     The  number  of  IP datagrams that have been successfully fragmented at this
                     entity per second [ipFragOKs].

              fragcrt/s
                     The number of IP datagram fragments that have been generated per second as a
                     result of fragmentation at this entity [ipFragCreates].

              With the EIP keyword, statistics about IPv4 network errors are reported.  Note that
              IPv4 statistics depend on sadc's option "-S SNMP" to be collected.   The  following
              values are displayed (formal SNMP names between square brackets):

              ihdrerr/s
                     The number of input datagrams discarded per second due to errors in their IP
                     headers, including bad checksums,  version  number  mismatch,  other  format
                     errors,  time-to-live  exceeded,  errors  discovered  in processing their IP
                     options, etc. [ipInHdrErrors]

              iadrerr/s
                     The number of input datagrams discarded per second because the IP address in
                     their  IP  header's destination field was not a valid address to be received
                     at this entity. This count includes invalid addresses  (e.g.,  0.0.0.0)  and
                     addresses of unsupported Classes (e.g., Class E). For entities which are not
                     IP routers and therefore do not forward  datagrams,  this  counter  includes
                     datagrams  discarded because the destination address was not a local address
                     [ipInAddrErrors].

              iukwnpr/s
                     The  number  of  locally-addressed  datagrams  received   successfully   but
                     discarded   per  second  because  of  an  unknown  or  unsupported  protocol
                     [ipInUnknownProtos].

              idisc/s
                     The number of input IP datagrams per  second  for  which  no  problems  were
                     encountered  to prevent their continued processing, but which were discarded
                     (e.g., for lack of buffer space) [ipInDiscards].   Note  that  this  counter
                     does not include any datagrams discarded while awaiting re-assembly.

              odisc/s
                     The  number  of  output  IP  datagrams  per  second for which no problem was
                     encountered to prevent their transmission to their  destination,  but  which
                     were  discarded (e.g., for lack of buffer space) [ipOutDiscards].  Note that
                     this counter would include datagrams counted in fwddgm/s if any such packets
                     met this (discretionary) discard criterion.

              onort/s
                     The  number  of  IP datagrams discarded per second because no route could be
                     found to transmit them to their destination [ipOutNoRoutes].  Note that this
                     counter  includes any packets counted in fwddgm/s which meet this 'no-route'
                     criterion.  Note that this includes any datagrams which a host cannot  route
                     because all of its default routers are down.

              asmf/s
                     The  number  of failures detected per second by the IP re-assembly algorithm
                     (for whatever reason: timed out, errors,  etc)  [ipReasmFails].   Note  that
                     this  is  not  necessarily  a  count  of  discarded  IP fragments since some
                     algorithms can lose track of the number of fragments by  combining  them  as
                     they are received.

              fragf/s
                     The  number of IP datagrams that have been discarded per second because they
                     needed to be fragmented at this entity but could not be, e.g., because their
                     Don't Fragment flag was set [ipFragFails].

              With  the  IP6  keyword,  statistics about IPv6 network traffic are reported.  Note
              that IPv6 statistics depend on sadc's  option  "-S  IPV6"  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              irec6/s
                     The  total  number  of  input datagrams received from interfaces per second,
                     including those received in error [ipv6IfStatsInReceives].

              fwddgm6/s
                     The number of output datagrams per second which  this  entity  received  and
                     forwarded to their final destinations [ipv6IfStatsOutForwDatagrams].

              idel6/s
                     The  total  number  of  datagrams  successfully delivered per second to IPv6
                     user-protocols (including ICMP) [ipv6IfStatsInDelivers].

              orq6/s
                     The  total  number  of  IPv6  datagrams  which  local  IPv6   user-protocols
                     (including  ICMP)  supplied  per second to IPv6 in requests for transmission
                     [ipv6IfStatsOutRequests].  Note that  this  counter  does  not  include  any
                     datagrams counted in fwddgm6/s.

              asmrq6/s
                     The  number  of  IPv6  fragments  received  per  second  which  needed to be
                     reassembled at this interface [ipv6IfStatsReasmReqds].

              asmok6/s
                     The  number  of  IPv6  datagrams   successfully   reassembled   per   second
                     [ipv6IfStatsReasmOKs].

              imcpck6/s
                     The  number  of  multicast  packets  received  per  second  by the interface
                     [ipv6IfStatsInMcastPkts].

              omcpck6/s
                     The number of multicast packets transmitted  per  second  by  the  interface
                     [ipv6IfStatsOutMcastPkts].

              fragok6/s
                     The  number of IPv6 datagrams that have been successfully fragmented at this
                     output interface per second [ipv6IfStatsOutFragOKs].

              fragcr6/s
                     The number of output datagram fragments that have been generated per  second
                     as    a    result    of    fragmentation    at    this    output   interface
                     [ipv6IfStatsOutFragCreates].

              With the EIP6 keyword, statistics about IPv6 network  errors  are  reported.   Note
              that  IPv6  statistics  depend  on  sadc's  option  "-S IPV6" to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              ihdrer6/s
                     The number of input datagrams discarded per second due to  errors  in  their
                     IPv6  headers,  including  version number mismatch, other format errors, hop
                     count exceeded, errors discovered in processing  their  IPv6  options,  etc.
                     [ipv6IfStatsInHdrErrors]

              iadrer6/s
                     The  number of input datagrams discarded per second because the IPv6 address
                     in their IPv6 header's destination field was  not  a  valid  address  to  be
                     received  at  this entity. This count includes invalid addresses (e.g., ::0)
                     and unsupported addresses (e.g., addresses with unallocated  prefixes).  For
                     entities  which are not IPv6 routers and therefore do not forward datagrams,
                     this counter includes datagrams discarded because  the  destination  address
                     was not a local address [ipv6IfStatsInAddrErrors].

              iukwnp6/s
                     The   number   of  locally-addressed  datagrams  received  successfully  but
                     discarded  per  second  because  of  an  unknown  or  unsupported   protocol
                     [ipv6IfStatsInUnknownProtos].

              i2big6/s
                     The number of input datagrams that could not be forwarded per second because
                     their   size   exceeded    the    link    MTU    of    outgoing    interface
                     [ipv6IfStatsInTooBigErrors].

              idisc6/s
                     The  number  of  input  IPv6 datagrams per second for which no problems were
                     encountered to prevent their continued processing, but which were  discarded
                     (e.g.,  for  lack  of  buffer space) [ipv6IfStatsInDiscards]. Note that this
                     counter does not include any datagrams discarded while awaiting re-assembly.

              odisc6/s
                     The number of output IPv6 datagrams per second  for  which  no  problem  was
                     encountered  to  prevent  their transmission to their destination, but which
                     were discarded (e.g., for lack of  buffer  space)  [ipv6IfStatsOutDiscards].
                     Note  that  this counter would include datagrams counted in fwddgm6/s if any
                     such packets met this (discretionary) discard criterion.

              inort6/s
                     The number of input datagrams discarded per second because no route could be
                     found to transmit them to their destination [ipv6IfStatsInNoRoutes].

              onort6/s
                     The number of locally generated IP datagrams discarded per second because no
                     route could be found to transmit them to their destination  [unknown  formal
                     SNMP name].

              asmf6/s
                     The number of failures detected per second by the IPv6 re-assembly algorithm
                     (for whatever reason:  timed  out,  errors,  etc.)  [ipv6IfStatsReasmFails].
                     Note  that this is not necessarily a count of discarded IPv6 fragments since
                     some algorithms can lose track of the number of fragments by combining  them
                     as they are received.

              fragf6/s
                     The  number  of  IPv6  datagrams that have been discarded per second because
                     they needed to be fragmented at this  output  interface  but  could  not  be
                     [ipv6IfStatsOutFragFails].

              itrpck6/s
                     The  number  of  input datagrams discarded per second because datagram frame
                     didn't carry enough data [ipv6IfStatsInTruncatedPkts].

              With the NFS keyword, statistics about  NFS  client  activity  are  reported.   The
              following values are displayed:

              call/s
                     Number of RPC requests made per second.

              retrans/s
                     Number  of  RPC  requests per second, those which needed to be retransmitted
                     (for example because of a server timeout).

              read/s
                     Number of 'read' RPC calls made per second.

              write/s
                     Number of 'write' RPC calls made per second.

              access/s
                     Number of 'access' RPC calls made per second.

              getatt/s
                     Number of 'getattr' RPC calls made per second.

              With the NFSD keyword, statistics about NFS  server  activity  are  reported.   The
              following values are displayed:

              scall/s
                     Number of RPC requests received per second.

              badcall/s
                     Number  of  bad  RPC  requests  received  per second, those whose processing
                     generated an error.

              packet/s
                     Number of network packets received per second.

              udp/s
                     Number of UDP packets received per second.

              tcp/s
                     Number of TCP packets received per second.

              hit/s
                     Number of reply cache hits per second.

              miss/s
                     Number of reply cache misses per second.

              sread/s
                     Number of 'read' RPC calls received per second.

              swrite/s
                     Number of 'write' RPC calls received per second.

              saccess/s
                     Number of 'access' RPC calls received per second.

              sgetatt/s
                     Number of 'getattr' RPC calls received per second.

              With the SOCK keyword, statistics on sockets  in  use  are  reported  (IPv4).   The
              following values are displayed:

              totsck
                     Total number of sockets used by the system.

              tcpsck
                     Number of TCP sockets currently in use.

              udpsck
                     Number of UDP sockets currently in use.

              rawsck
                     Number of RAW sockets currently in use.

              ip-frag
                     Number of IP fragments currently in queue.

              tcp-tw
                     Number of TCP sockets in TIME_WAIT state.

              With  the  SOCK6  keyword,  statistics on sockets in use are reported (IPv6).  Note
              that IPv6 statistics depend on sadc's  option  "-S  IPV6"  to  be  collected.   The
              following values are displayed:

              tcp6sck
                     Number of TCPv6 sockets currently in use.

              udp6sck
                     Number of UDPv6 sockets currently in use.

              raw6sck
                     Number of RAWv6 sockets currently in use.

              ip6-frag
                     Number of IPv6 fragments currently in use.

              With  the  SOFT  keyword,  statistics  about  software-based network processing are
              reported.  The following values are displayed:

              total/s
                     The total number of network frames processed per second.

              dropd/s
                     The total number of network frames dropped per second because there  was  no
                     room on the processing queue.

              squeezd/s
                     The  number  of  times  the  softirq  handler function terminated per second
                     because its budget was consumed or the time limit was reached, but more work
                     could have been done.

              rx_rps/s
                     The  number of times the CPU has been woken up per second to process packets
                     via an inter-processor interrupt.

              flw_lim/s
                     The number of times the flow  limit  has  been  reached  per  second.   Flow
                     limiting  is an optional RPS feature that can be used to limit the number of
                     packets queued to the backlog for each flow to a certain amount.   This  can
                     help  ensure  that smaller flows are processed even though much larger flows
                     are pushing packets in.

              With the TCP keyword, statistics about TCPv4 network traffic  are  reported.   Note
              that  TCPv4  statistics  depend  on  sadc's  option "-S SNMP" to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              active/s
                     The number of times TCP connections have made a  direct  transition  to  the
                     SYN-SENT state from the CLOSED state per second [tcpActiveOpens].

              passive/s
                     The  number  of  times  TCP connections have made a direct transition to the
                     SYN-RCVD state from the LISTEN state per second [tcpPassiveOpens].

              iseg/s
                     The total number of segments received per second, including  those  received
                     in  error  [tcpInSegs].   This count includes segments received on currently
                     established connections.

              oseg/s
                     The total number of segments sent per second,  including  those  on  current
                     connections   but  excluding  those  containing  only  retransmitted  octets
                     [tcpOutSegs].

              With the ETCP keyword, statistics about TCPv4 network errors  are  reported.   Note
              that  TCPv4  statistics  depend  on  sadc's  option "-S SNMP" to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              atmptf/s
                     The number of times per second TCP connections have made a direct transition
                     to  the  CLOSED  state from either the SYN-SENT state or the SYN-RCVD state,
                     plus the number of times per second  TCP  connections  have  made  a  direct
                     transition to the LISTEN state from the SYN-RCVD state [tcpAttemptFails].

              estres/s
                     The number of times per second TCP connections have made a direct transition
                     to the CLOSED state from either the  ESTABLISHED  state  or  the  CLOSE-WAIT
                     state [tcpEstabResets].

              retrans/s
                     The  total number of segments retransmitted per second - that is, the number
                     of TCP segments transmitted containing one or  more  previously  transmitted
                     octets [tcpRetransSegs].

              isegerr/s
                     The total number of segments received in error (e.g., bad TCP checksums) per
                     second [tcpInErrs].

              orsts/s
                     The number  of  TCP  segments  sent  per  second  containing  the  RST  flag
                     [tcpOutRsts].

              With  the  UDP  keyword, statistics about UDPv4 network traffic are reported.  Note
              that UDPv4 statistics depend on sadc's option  "-S  SNMP"  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              idgm/s
                     The  total  number  of  UDP  datagrams  delivered  per  second  to UDP users
                     [udpInDatagrams].

              odgm/s
                     The total  number  of  UDP  datagrams  sent  per  second  from  this  entity
                     [udpOutDatagrams].

              noport/s
                     The total number of received UDP datagrams per second for which there was no
                     application at the destination port [udpNoPorts].

              idgmerr/s
                     The number of received UDP datagrams per second that could not be  delivered
                     for  reasons  other  than the lack of an application at the destination port
                     [udpInErrors].

              With the UDP6 keyword, statistics about UDPv6 network traffic are  reported.   Note
              that  UDPv6  statistics  depend  on  sadc's  option "-S IPV6" to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              idgm6/s
                     The total number  of  UDP  datagrams  delivered  per  second  to  UDP  users
                     [udpInDatagrams].

              odgm6/s
                     The  total  number  of  UDP  datagrams  sent  per  second  from  this entity
                     [udpOutDatagrams].

              noport6/s
                     The total number of received UDP datagrams per second for which there was no
                     application at the destination port [udpNoPorts].

              idgmer6/s
                     The  number of received UDP datagrams per second that could not be delivered
                     for reasons other than the lack of an application at  the  destination  port
                     [udpInErrors].

              The  ALL  keyword  is equivalent to specifying all the keywords above and therefore
              all the network activities are reported.

       -o [ filename ]
              Save the readings in the file in binary form. Each reading is in a separate record.
              The default value of the filename parameter is the current standard system activity
              daily data file.  If filename is a directory instead of a plain  file  then  it  is
              considered as the directory where the standard system activity daily data files are
              located.  The -o option is exclusive of the -f option.  All the data available from
              the  kernel  are saved in the file (in fact, sar calls its data collector sadc with
              the option "-S ALL".  See sadc(8) manual page).

       -P { cpu_list | ALL }
              Report  per-processor  statistics  for  the  specified  processor  or   processors.
              cpu_list   is   a  list  of  comma-separated  values  or  range  of  values  (e.g.,
              0,2,4-7,12-).  Note that processor 0 is the first processor, and processor  all  is
              the  global  average  among  all  processors.   Specifying  the ALL keyword reports
              statistics for each individual processor, and globally for all processors.  Offline
              processors are not displayed.

       -p     Pretty-print  device  names.  Use  this  option  in conjunction with option -d.  By
              default names are printed as devM-n where M and n are the major and  minor  numbers
              for  the  device.   Use  of  this  option displays the names of the devices as they
              (should)    appear    in    /dev.    Name    mappings     are     controlled     by
              /etc/sysstat/sysstat.ioconf.

       -q     Report queue length and load averages. The following values are displayed:

              runq-sz
                     Run queue length (number of tasks waiting for run time).

              plist-sz
                     Number of tasks in the task list.

              ldavg-1
                     System  load average for the last minute.  The load average is calculated as
                     the average number of runnable or running tasks (R state), and the number of
                     tasks in uninterruptible sleep (D state) over the specified interval.

              ldavg-5
                     System load average for the past 5 minutes.

              ldavg-15
                     System load average for the past 15 minutes.

              blocked
                     Number of tasks currently blocked, waiting for I/O to complete.

       -r [ ALL ]
              Report memory utilization statistics. The ALL keyword indicates that all the memory
              fields should be displayed.  The following values may be displayed:

              kbmemfree
                     Amount of free memory available in kilobytes.

              kbavail
                     Estimate of how much memory in  kilobytes  is  available  for  starting  new
                     applications,  without  swapping.   The estimate takes into account that the
                     system needs some page cache to function well, and that not all  reclaimable
                     slab  will  be  reclaimable,  due to items being in use. The impact of those
                     factors will vary from system to system.

              kbmemused
                     Amount of used memory in kilobytes (calculated as total installed  memory  -
                     kbmemfree - kbbuffers - kbcached - kbslab).

              %memused
                     Percentage of used memory.

              kbbuffers
                     Amount of memory used as buffers by the kernel in kilobytes.

              kbcached
                     Amount of memory used to cache data by the kernel in kilobytes.

              kbcommit
                     Amount  of  memory  in  kilobytes  needed  for  current workload. This is an
                     estimate of how much RAM/swap is needed to guarantee that there never is out
                     of memory.

              %commit
                     Percentage  of  memory  needed for current workload in relation to the total
                     amount of memory (RAM+swap).  This number may be greater than  100%  because
                     the kernel usually overcommits memory.

              kbactive
                     Amount  of  active  memory  in  kilobytes  (memory  that  has been used more
                     recently and usually not reclaimed unless absolutely necessary).

              kbinact
                     Amount of inactive memory in kilobytes (memory which has been less  recently
                     used. It is more eligible to be reclaimed for other purposes).

              kbdirty
                     Amount of memory in kilobytes waiting to get written back to the disk.

              kbanonpg
                     Amount  of  non-file  backed  pages  in kilobytes mapped into userspace page
                     tables.

              kbslab
                     Amount of memory in kilobytes used by the kernel to  cache  data  structures
                     for its own use.

              kbkstack
                     Amount of memory in kilobytes used for kernel stack space.

              kbpgtbl
                     Amount of memory in kilobytes dedicated to the lowest level of page tables.

              kbvmused
                     Amount of memory in kilobytes of used virtual address space.

       -S     Report swap space utilization statistics.  The following values are displayed:

              kbswpfree
                     Amount of free swap space in kilobytes.

              kbswpused
                     Amount of used swap space in kilobytes.

              %swpused
                     Percentage of used swap space.

              kbswpcad
                     Amount  of  cached  swap  memory in kilobytes.  This is memory that once was
                     swapped out, is swapped back in but still also  is  in  the  swap  area  (if
                     memory  is  needed  it  doesn't  need  to be swapped out again because it is
                     already in the swap area. This saves I/O).

              %swpcad
                     Percentage of cached swap memory in relation to  the  amount  of  used  swap
                     space.

       -s [ hh:mm[:ss] ]
              Set  the  starting  time  of  the  data, causing the sar command to extract records
              time-tagged at, or following, the time specified.  The  default  starting  time  is
              08:00:00.  Hours must be given in 24-hour format. This option can be used only when
              data are read from a file (option -f).

       --sadc Indicate which data collector is called by sar.  If the data collector is sought in
              PATH then enter "which sadc" to know where it is located.

       -t     When  reading  data  from  a  daily data file, indicate that sar should display the
              timestamps in the original local time  of  the  data  file  creator.  Without  this
              option, the sar command displays the timestamps in the user's locale time.

       -u [ ALL ]
              Report CPU utilization. The ALL keyword indicates that all the CPU fields should be
              displayed.  The report may show the following fields:

              %user
                     Percentage of CPU utilization that occurred  while  executing  at  the  user
                     level  (application).  Note  that  this  field  includes  time spent running
                     virtual processors.

              %usr
                     Percentage of CPU utilization that occurred  while  executing  at  the  user
                     level  (application).  Note  that  this  field  does  NOT include time spent
                     running virtual processors.

              %nice
                     Percentage of CPU utilization that occurred  while  executing  at  the  user
                     level with nice priority.

              %system
                     Percentage  of  CPU  utilization that occurred while executing at the system
                     level (kernel). Note that this field includes time spent servicing  hardware
                     and software interrupts.

              %sys
                     Percentage  of  CPU  utilization that occurred while executing at the system
                     level (kernel). Note that this field does NOT include time  spent  servicing
                     hardware or software interrupts.

              %iowait
                     Percentage  of  time  that the CPU or CPUs were idle during which the system
                     had an outstanding disk I/O request.

              %steal
                     Percentage of time spent in involuntary wait by  the  virtual  CPU  or  CPUs
                     while the hypervisor was servicing another virtual processor.

              %irq
                     Percentage of time spent by the CPU or CPUs to service hardware interrupts.

              %soft
                     Percentage of time spent by the CPU or CPUs to service software interrupts.

              %guest
                     Percentage of time spent by the CPU or CPUs to run a virtual processor.

              %gnice
                     Percentage of time spent by the CPU or CPUs to run a niced guest.

              %idle
                     Percentage  of  time  that  the CPU or CPUs were idle and the system did not
                     have an outstanding disk I/O request.

       -V     Print version number then exit.

       -v     Report status of inode, file and other kernel tables.   The  following  values  are
              displayed:

              dentunusd
                     Number of unused cache entries in the directory cache.

              file-nr
                     Number of file handles used by the system.

              inode-nr
                     Number of inode handlers used by the system.

              pty-nr
                     Number of pseudo-terminals used by the system.

       -W     Report swapping statistics. The following values are displayed:

              pswpin/s
                     Total number of swap pages the system brought in per second.

              pswpout/s
                     Total number of swap pages the system brought out per second.

       -w     Report task creation and system switching activity.

              proc/s
                     Total number of tasks created per second.

              cswch/s
                     Total number of context switches per second.

       -y     Report TTY devices activity. The following values are displayed:

              rcvin/s
                     Number of receive interrupts per second for current serial line. Serial line
                     number is given in the TTY column.

              xmtin/s
                     Number of transmit interrupts per second for current serial line.

              framerr/s
                     Number of frame errors per second for current serial line.

              prtyerr/s
                     Number of parity errors per second for current serial line.

              brk/s
                     Number of breaks per second for current serial line.

              ovrun/s
                     Number of overrun errors per second for current serial line.

       -z     Tell sar to omit output for any devices for which there was no activity during  the
              sample period.

ENVIRONMENT

       The sar command takes into account the following environment variables:

       S_COLORS
              When  this  variable is set, display statistics in color on the terminal.  Possible
              values for this variable are never, always or auto (the latter is the default).

              Note: On Debian sysstems the  colors  are  displayed  by  default  when  output  is
              connected to the terminal, even if this variable is not set (i.e. unset variable is
              treated as if it were set to auto).

              Please note that the color (being red, yellow, or some other color) used to display
              a value is not indicative of any kind of issue simply because of the color. It only
              indicates different ranges of values.

       S_COLORS_SGR
              Specify the colors and other attributes used to display statistics on the terminal.
              Its   value   is   a   colon-separated   list  of  capabilities  that  defaults  to
              C=33;22:H=31;1:I=32;22:M=35;1:N=34;1:R=31;22:Z=34;22.  Supported capabilities are:

              C=     SGR (Select Graphic Rendition) substring for comments inserted in the binary
                     daily data files.

              H=     SGR substring for percentage values greater than or equal to 75%.

              I=     SGR  substring  for  item  names  or  values  (eg.  network  interfaces, CPU
                     number...)

              M=     SGR substring for percentage values in the range from 50% to 75%.

              N=     SGR substring for non-zero statistics values.

              R=     SGR substring for restart messages.

              Z=     SGR substring for zero values.

       S_TIME_DEF_TIME
              If this variable exists and its value is UTC then sar will save  its  data  in  UTC
              time  (data  will  still  be  displayed in local time).  sar will also use UTC time
              instead of local time to determine the current  daily  data  file  located  in  the
              /var/log/sysstat  directory.  This  variable  may  be useful for servers with users
              located across several timezones.

       S_TIME_FORMAT
              If this variable exists and its value is  ISO  then  the  current  locale  will  be
              ignored  when printing the date in the report header.  The sar command will use the
              ISO 8601 format (YYYY-MM-DD) instead.  The timestamp will also  be  compliant  with
              ISO 8601 format.

EXAMPLES

       sar -u 2 5
              Report CPU utilization for each 2 seconds. 5 lines are displayed.

       sar -I 14 -o int14.file 2 10
              Report  statistics  on IRQ 14 for each 2 seconds. 10 lines are displayed.  Data are
              stored in a file called int14.file.

       sar -r -n DEV -f /var/log/sysstat/sa16
              Display memory and network statistics saved in daily data file 'sa16'.

       sar -A
              Display all the statistics saved in current daily data file.

BUGS

       /proc filesystem must be mounted for the sar command to work.

       All the statistics are not necessarily available, depending on the  kernel  version  used.
       sar assumes that you are using at least a 2.6 kernel.

FILES

       /var/log/sysstat/saDD
       /var/log/sysstat/saYYYYMMDD
              The  standard  system  activity  daily data files and their default location.  YYYY
              stands for the current year, MM for the current month and DD for the current day.

       /proc and /sys contain various files with system statistics.

AUTHOR

       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO

       sadc(8), sa1(8), sa2(8), sadf(1), sysstat(5), pidstat(1), mpstat(1), iostat(1), vmstat(8)

       https://github.com/sysstat/sysstat

       http://pagesperso-orange.fr/sebastien.godard/