Provided by: sg3-utils_1.44-1ubuntu2_amd64 bug

NAME

       sg_logs - access log pages with SCSI LOG SENSE command

SYNOPSIS

       sg_logs  [--All]  [--all] [--brief] [--filter=FL] [--hex] [--list] [--maxlen=LEN] [--name]
       [--no_inq] [--page=PG]  [--paramp=PP]  [--pcb]  [--ppc]  [--pdt=DT]  [--raw]  [--readonly]
       [--sp] [--temperature] [--transport] [--vendor=VP] [--verbose] DEVICE

       sg_logs [--brief] [--filter=FL] [--hex] --in=FN [--name] [--pdt=DT] [--raw] [--vendor=VP]

       sg_logs [--control=PC] [--in=FN] [--page=PG] [--raw] [--reset] --select [--sp] [--verbose]
       DEVICE

       sg_logs [--enumerate] [--filter=FL] [--help] [--vendor=VP] [--version]

       sg_logs [-a] [-A] [-b] [-D=DT] [-c=PC] [-e] [-f=FL] [-h] [-H] [-i=FN] [-l]  [-L]  [-m=LEN]
       [-M=VP]  [-n]  [-p=PG] [-paramp=PP] [-pcb] [-ppc] [-r] [-R] [-select] [-sp] [-t] [-T] [-v]
       [-V] [-?]  [-x] DEVICE

DESCRIPTION

       This utility sends a SCSI LOG SENSE command to the DEVICE and then outputs  the  response.
       The  LOG SENSE command is used to fetch log pages which, if known, are decoded by default.
       When the --reset and/or --select option is given then a SCSI LOG SELECT command is  issued
       to  the  DEVICE.  Alternatively one or more log page responses can be in a file read using
       the --in=FN option; in this case those responses are decoded and the DEVICE  argument,  if
       given, is ignored.

       In  SPC-4  revision  5  a subpage code was introduced to both the LOG SENSE and LOG SELECT
       command. At the same time a page code field was  introduced  to  the  to  the  LOG  SELECT
       command.  The  log subpage code can range from 0 to 255 (0xff) inclusive. The subpage code
       value 255 can be thought of as a wildcard.

       The SYNOPSIS section above is divided into five forms. The first form  shows  the  options
       that  can  be  used to send a LOG SENSE command to the DEVICE and decode its response. The
       second form fetches data from a file (named FN) and decodes it as if it  were  a  response
       from  a LOG SENSE command. The third form shows the options that can be used to send a LOG
       SELECT command. The fourth form groups various management options.  The  last  form  shows
       the   older,   deprecated   command  line  interface  which  is  maintained  for  backward
       compatibility.

OPTIONS

       Arguments to long options are mandatory for  short  options  as  well.   The  options  are
       arranged in alphabetical order based on the long option name.

       -A, --All
              fetch  and  decode  all  the  log pages and subpages supported by the DEVICE.  This
              requires a two stage process: first the "supported log pages and subpages" log page
              is  fetched,  then  for  each entry in its response, the corresponding log page (or
              subpage) is fetched and displayed. Note that there are many SCSI  devices  that  do
              not  support  LOG SENSE subpages and respond to this option with an illegal request
              sense key (or ignored the subpage field).

       -a, --all
              outputs all the log pages supported by  the  DEVICE.  This  requires  a  two  stage
              process:  first  the "supported log pages" log page is fetched, then for each entry
              in its response, the corresponding log page is fetched  and  displayed.  When  used
              twice (e.g. '-aa') all log pages and subpages are fetched.

       -b, --brief
              shorten  the  amount  of  output for some log pages. For example the Tape Alert log
              page only outputs parameters whose flags are set when --brief is given.

       -c, --control=PC
              accepts 0, 1, 2 or 3 for the PC argument:
                0 : current threshold values
                1 : current cumulative values
                2 : default threshold values
                3 : default cumulative values
              The default value is 1 (i.e. current cumulative values).

       -e, --enumerate
              this option is used to output information held in internal tables about  known  log
              pages  including  their  name, acronym and fields. If given, the DEVICE argument is
              ignored. When given once  (e.g.  '-e')  all  known  pages  are  listed,  sorted  in
              ascending  acronym order (alphabetic). When given twice, vendor pages are excluded.
              When given three times, all known pages are listed,  sorted  in  ascending  numeric
              order  listed;  when  given  four times, vendor pages are excluded from the numeric
              order.
              The --filter=FL and --verbose options reduce the output of the enumeration.

       -f, --filter=FL
              FL is either a parameter code when DEVICE is given, or  a  peripheral  device  type
              (pdt) (or other) if --enumerate is given.
              In  the parameter code case FL is a value between 0 and 65535 (0xffff) and only the
              parameter section matching that code is output. If the --hex option  is  given  the
              log parameter is output in hexadecimal rather than decoding it. If the --hex option
              is used twice then the leading address on each line of hex is removed. If the --raw
              option  is given then the log parameter is output in binary. Most log pages contain
              one or more log parameters. Examples of those that don't follow that convention are
              those pages that list supported log pages (and subpages).
              In  the  --enumerate  case, when FL >= zero it is taken as a pdt value and only log
              pages associated with that pdt plus generic pages listed in SPC are enumerated.  If
              FL  is -1 then the filter does nothing which is the same as not giving this option;
              when FL is -2 then only generic pages listed in SPC are enumerated. If  FL  is  -10
              then only generic direct access like (e.g. disk) pages are enumerated. If FL is -11
              then only generic tape like pages (e.g. includes ADC) are enumerated.

       -h, --help
              print out the usage message then exit.

       -H, --hex
              The default action is to decode known log page numbers (and subpage  numbers)  into
              text.  When  this  option is used once, the response is output in hexadecimal. When
              used twice, each line of hex has the ASCII equivalent shown to the right. When used
              three  times,  the hex has no leading address nor trailing ASCII making it suitable
              to be placed in a file (or piped).  That  file  might  later  be  used  by  another
              invocation using the --in=FN option.

       -i, --in=FN
              This option may be used in two different contexts. One is with the --select to send
              a LOG SELECT command to the given DEVICE; see the LOG SELECT section below.
              The other context is with no DEVICE argument given in which case the contents of FN
              are  decoded  as  if it were the response of a LOG SENSE command (i.e. a log page).
              For decoding the page and subpage numbers are taken from FN  while  the  peripheral
              device type is either generic (i.e. from SPC) or the value given by --pdt=DT.
              FN is treated as a file name (or '-' for stdin) which contains ASCII hexadecimal or
              binary representing a log page. The hexadecimal should be arranged as 1 or 2 digits
              representing  a  byte each of which is whitespace or comma separated. Anything from
              and including a hash mark to the end of line is ignored. If  the  --raw  option  is
              also given then FN is treated as binary.

       -l, --list
              lists  the  names of all logs sense pages supported by this device. This is done by
              reading the "supported log pages" log page. When used twice (e.g. '-ll') lists  the
              names  of  all  logs  sense pages and subpages supported by this device. There is a
              list of common log page codes below.

       -m, --maxlen=LEN
              sets the "allocation length" field in the LOG SENSE cdb. The is the maximum  length
              in  bytes  that  the response will be. Without this option (or LEN equal to 0) this
              utility first fetches the 4 byte response then does a second access with the length
              indicated  in  the  first  (4 byte) response. Negative values and 1 for LEN are not
              accepted. LEN cannot exceed 65535 (0xffff).  Responses can be quite large (e.g. the
              background  scan  results log page) and this option can be used to limit the amount
              of information returned.

       -n, --name
              decode some log pages into 'name=value' entries, one per line. The name contains no
              space  and  may  be  abbreviated  and the value is decimal unless prefixed by '0x'.
              Nesting is indicated by leading spaces. This form is meant to be relatively easy to
              parse.

       -x, --no_inq
              suppresses  the  output of information obtained from an initial call to the INQUIRY
              command for the standard response. The default (assuming some  other  options  that
              suppress this output are also not given) is to output several device identification
              strings.
              If this option is given twice (or more) then no INQUIRY command is sent hence there
              will  be  no device identification string output either. Also the peripheral device
              type (PDT) field will not  be  obtained  so  this  utility  will  not  be  able  to
              differentiate  between  some  log pages that are device dependent. It will assume a
              PDT of 0 (i.e. a disk).

       -O, --old
              Switch to older style options. Please use as first option.

       -p, --page=PG
              log page name/number to access. PG is either an acronym, a page number, or a  page,
              subpage  number pair. Available acronyms can be listed with the --enumerate option.
              Page (0 to 63) and subpage (0 to 255) numbers are comma separated. They are decimal
              unless  a hexadecimal indication is given. A hexadecimal number can be specified by
              a leading "0x" or a trailing "h".
              A few acronyms specify a range of subpage values in which case the acronym  may  be
              followed  by  a  comma then a subpage number. This method can also be used to fetch
              the Supported subpages log page (e.g. --page=temp,0xff).

       -P, --paramp=PP
              PP is the parameter pointer value to place in a field of that name in the LOG SENSE
              cdb.  A  decimal  number in the range 0 to 65535 (0xffff) is expected. When a value
              greater than 0 is given the --ppc option should be selected. The default  value  is
              0.

       -q, --pcb
              show  Parameter  Control  Byte  settings  (only  relevant when log parameters being
              output in ASCII).

       -Q, --ppc
              sets the Parameter Pointer Control (PPC) bit in the LOG SENSE  cdb.  Default  is  0
              (i.e. cleared). This bit was made obsolete in SPC-4 revision 18.

       -D, --pdt=DT
              DT  is  the  peripheral  device type that is used when it is not available from the
              DEVICE. There are two main cases of this: with the --pdt=DT without  a  DEVICE  and
              when --no_inq is used with a DEVICE.

       -r, --raw
              output  the response in binary to stdout. Error messages and warnings are output to
              stderr.
              This option may also be given together with --in=FN in which case the  contents  of
              FN  are  interpreted  as  binary  data  (and the response is decoded as normal, not
              dumped as binary).

       -R, --readonly
              open the DEVICE read-only (e.g. in Unix with the O_RDONLY flag). The default action
              is  to  try  and  open  DEVICE read-write then if that fails try to open again with
              read-only. However when a read-write open succeeds  there  may  still  be  unwanted
              actions  on  the  close  (e.g. some OSes try to do a SYNCHRONIZE CACHE command). So
              this option forces a read-only open on DEVICE and if it fails,  this  utility  will
              exit. Note that options like --select most likely need a read-write open.

       -R, --reset
              use  SCSI  LOG SELECT command (with the PCR bit set) to reset the all log pages (or
              the given page). Exactly what is reset depends on the  accompanying  SP  bit  (i.e.
              --sp  option which defaults to 0) and the PC ("page control") value (which defaults
              to 1). Supplying this option implies the --select option as well. This option seems
              to  clear  error  counter  log  pages  but  leaves  pages  like  self-test results,
              start-stop cycle counter and temperature log pages unaffected. This option  may  be
              required  to  clear  log pages if a counter reaches its maximum value since the log
              page in which the counter is found will remain "stuck" at its maximum  value  until
              some user interaction (e.g. calling sg_logs with this option).

       -S, --select
              use  a  LOG  SELECT  command. The default action (i.e. when neither this option nor
              --reset is given) is to do a LOG SENSE command. See the LOG SELECT section.

       -s, --sp
              sets the Saving Parameters (SP) bit. Default is 0 (i.e.  cleared).  When  set  this
              instructs  the device to store the current log page parameters (as indicated by the
              DS and  TSD  parameter  codes)  in  some  non-volatile  location.   Hence  the  log
              parameters  will  be  preserved  across  power cycles. This option is typically not
              needed, especially if the GLTSD flag is clear in the  control  mode  page  as  this
              instructs   the  device  to  periodically  save  all  saveable  log  parameters  to
              non-volatile locations.

       -t, --temperature
              outputs the temperature. First looks in the temperature log page and if that is not
              available  tries  the  Informational  Exceptions  log  page which may also have the
              current temperature (especially on older disks).

       -T, --transport
              outputs the transport ('Protocol specific port') log page.  Equivalent  to  setting
              '--page=18h'.

       -M, --vendor=VP
              where  VP  is  a  vendor  (e.g. "sea" for Seagate) or product (group) acronym (e.g.
              "lto5" for the 5th generation LTO (tape) consortium). Either the whole log page  is
              vendor  specific (e.g. page numbers 0x30 to 0x3f) or part of a T10 defined log page
              is vendor specific. For example SPC-5 defines parameter code 0x0 of page 0x2f  (the
              Informational  Exceptions  log  page) and states that the remaining parameter codes
              (i.e. 0x1 to 0xffff) are vendor specific.  Using  a  VP  of  "xxx"  will  list  the
              available acronyms.
              If  this  option  is  used  with --page=PG and PG is an acronym then this option is
              ignored. If PG is a number (e.g. 0xc0) then VP is used to choose the  which  vendor
              specific page (e.g. sharing page number 0xc0) to decode.

       -v, --verbose
              increase  level  of verbosity. When used with --enumerate, in the list of known log
              page names, those that have no  associated  decode  logic  are  followed  by  "[hex
              only]".

       -V, --version
              print out version string then exit.

LOG SELECT

       The  SCSI  LOG  SELECT  command can be used to reset certain parameters to vendor specific
       defaults, save them to non-volatile storage (i.e. the media), or supply new page contents.
       This command has changed between SPC-3 and SPC-4 with the addition of the Page and Subpage
       Code fields which can only be non zero when the Parameter list length is zero.

       The --select (or --reset) option is required to issue a LOG SELECT command. If the --in=FN
       option  is  not given (or FN is effectively empty) then the Parameter list length field is
       set to zero. If the --in=FN option is is given then its decoded  data  is  placed  in  the
       data-out buffer and its length in bytes is placed in the Parameter list length field.

       Other options that are active with the LOG SELECT command are --control=PC, --reset (which
       sets the PCR bit) and --sp.

APPLICATION CLIENT

       This is the name of a log page that acts as a container for data provided by the user.  An
       application client is a SCSI term for the program that issues commands to a SCSI initiator
       (often known as a Host Bus Adapter (HBA)).  So,  for  example,  this  utility  is  a  SCSI
       application client.

       The  Application Client log page has 64 log parameters with parameters codes 0 to 63. Each
       can hold 252 bytes of user binary data. That 252 bytes (or less) of user data,  with  a  4
       byte  prefix (for a total of 256 bytes) can be provided with the --in=FN option. A typical
       prefix would be '0,n,83,fc'. The "n" is  the  parameter  code  in  hex  so  the  last  log
       parameter  would be '0,3f,83,fc'. That log parameter could be read back at some later time
       with '--page=0xf --filter=0x<n>'.

NOTES

       This utility will usually do a double fetch of log pages with the SCSI LOG SENSE  command.
       The  first fetch requests a 4 byte response (i.e. place 4 in the "allocation length" field
       in the cdb). From that response it can calculate the actual length of the  response  which
       is  what  it asks for on the second fetch. This is typical practice in SCSI and guaranteed
       to work in the standards. However some older devices don't comply. For those devices using
       the  --maxlen=LEN option will do a single fetch.  A value of 252 should be a safe starting
       point.

       Various log pages hold information error rates,  device  temperature,  start  stop  cycles
       since the device was produced and the results of the last 20 self tests. Self tests can be
       initiated by the sg_senddiag(8) utility.  The smartmontools package provides much  of  the
       information  found with sg_logs in a form suitable for monitoring the health of SCSI disks
       and tape drives.

       The simplest way to find which log pages can be decoded by this  utility  is  to  use  the
       --enumerate  option.  Some  page  names are known but there is no decode logic; such cases
       have "[hex only]" after the log  page  name  when  the  --verbose  option  is  given  with
       --enumerate.

EXIT STATUS

       The  exit status of sg_logs is 0 when it is successful. Otherwise see the sg3_utils(8) man
       page.

OLDER COMMAND LINE OPTIONS

       The options in this section were the only ones available prior to sg3_utils version 1.23 .
       Since then this utility defaults to the newer command line options which can be overridden
       by using --old (or -O) as the first option. See  the  ENVIRONMENT  VARIABLES  section  for
       another way to force the use of these older command line options.

       Options  with  arguments  or with two or more letters can have an extra '-' prepended. For
       example: both '-pcb' and '--pcb' are acceptable.

       -a     outputs all the log pages supported by the device.  Equivalent to --all in the main
              description.

       -A     outputs  all  the  log  pages  and subpages supported by the device.  Equivalent to
              '--all --all' in the main description.

       -c=PC  Equivalent to --control=PC in the main description.

       -e     enumerate internal tables to show information about known log pages.  Equivalent to
              --enumerate in the main description.

       -h     suppresses  decoding  of  known  log sense pages and prints out the response in hex
              instead.

       -i=FN  FN is treated as a file name (or '-' for stdin) which  contains  ASCII  hexadecimal
              representing  a  log  page  that  will  be  sent  as parameter data of a LOG SELECT
              command. See the LOG SELECT section.

       -H     same action  as  '-h'  in  this  section  and  equivalent  to  --hex  in  the  main
              description.

       -l     lists  the  names  of all logs sense pages supported by this device.  Equivalent to
              --list in the main description.

       -L     lists the names of all logs sense pages and  subpages  supported  by  this  device.
              Equivalent to '--list --list' in the main description.

       -m=LEN request  only  LEN bytes of response data. Default is 0 which is interpreted as all
              that is available. LEN is decimal unless it has a leading  '0x'  or  trailing  'h'.
              Equivalent to --maxlen=LEN in the main description.

       -M=VP  Equivalent to --vendor=VP in the main description.

       -n     Equivalent to --name in the main description.

       -N, --new
              Switch to the newer style options.

       -p=PG  log page code to access. PG is either an acronym, a page number, or a page, subpage
              pair. Available acronyms can be listed with the --enumerate option. Page (0 to  3f)
              and  subpage  (0  to ff) numbers are comma separated. The numbers are assumed to be
              hexadecimal.

       -paramp=PP
              PP is the parameter pointer value (in hex) to place in command.  Should be a number
              between 0 and ffff inclusive.

       -pcb   show  Parameter  Control  Byte  settings  (only  relevant when log parameters being
              output in ASCII).

       -ppc   sets the Parameter Pointer Control (PPC) bit. Default is 0 (i.e. cleared).

       -r     use SCSI LOG SELECT command (PCR bit set) to reset the all log pages (or the  given
              page). Equivalent to --reset in the main description.

       -R     Equivalent to --readonly in the main description.

       -select
              use a LOG SELECT command. Equivalent to --select in the main description.

       -sp    sets  the  Saving  Parameters (SP) bit. Default is 0 (i.e. cleared).  Equivalent to
              --sp in the main description.

       -t     outputs the temperature. Equivalent to --temperature in the main description.

       -T     outputs  the  transport  ('Protocol  specific  port')  log  page.   Equivalent   to
              --transport in the main description.

       -v     increase level of verbosity.

       -V     print out version string then exit.

       -x     suppress the INQUIRY command. Equivalent to --no_inq in the main description.

       -?     output usage message then exit.

ENVIRONMENT VARIABLES

       Since  sg3_utils  version  1.23  the environment variable SG3_UTILS_OLD_OPTS can be given.
       When it is present this utility will  expect  the  older  command  line  options.  So  the
       presence  of  this  environment variable is equivalent to using --old (or -O) as the first
       command line option.

AUTHOR

       Written by Douglas Gilbert

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright © 2002-2018 Douglas Gilbert
       This software is distributed under the GPL version 2. There is NO warranty; not  even  for
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO

       smartctl(smartmontools), sg_senddiag(8)