plucky (8) pvmove.8.gz

Provided by: lvm2_2.03.27-1ubuntu1_amd64 bug

NAME

       pvmove — Move extents from one physical volume to another

SYNOPSIS

       pvmove position_args
           [ option_args ]
           [ position_args ]

DESCRIPTION

       pvmove moves the allocated physical extents (PEs) on a source PV to one or more destination PVs.  You can
       optionally specify a source LV in which case only extents used by that LV  will  be  moved  to  free  (or
       specified)  extents on the destination PV. If no destination PV is specified, the normal allocation rules
       for the VG are used.

       If pvmove is interrupted for any reason (e.g. the machine crashes) then run pvmove again without  any  PV
       arguments  to  restart  any operations that were in progress from the last checkpoint. Alternatively, use
       the abort option at any time to abort the operation. The resulting location of LVs after an abort depends
       on whether the atomic option was used.

       More  than  one  pvmove  can  run  concurrently  if  they  are moving data from different source PVs, but
       additional pvmoves will ignore any LVs already in the process of being changed, so some  data  might  not
       get moved.

USAGE

       Move PV extents.

       pvmove PV
           [ -A|--autobackup y|n ]
           [ -n|--name LV ]
           [    --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit ]
           [    --atomic ]
           [    --noudevsync ]
           [    --reportformat basic|json|json_std ]
           [ COMMON_OPTIONS ]
           [ PV ... ]

       Continue or abort existing pvmove operations.

       pvmove
           [ COMMON_OPTIONS ]

       Common options for command:
           [ -b|--background ]
           [ -i|--interval Number ]
           [    --abort ]

       Common options for lvm:
           [ -d|--debug ]
           [ -h|--help ]
           [ -q|--quiet ]
           [ -t|--test ]
           [ -v|--verbose ]
           [ -y|--yes ]
           [    --commandprofile String ]
           [    --config String ]
           [    --devices PV ]
           [    --devicesfile String ]
           [    --driverloaded y|n ]
           [    --journal String ]
           [    --lockopt String ]
           [    --longhelp ]
           [    --nohints ]
           [    --nolocking ]
           [    --profile String ]
           [    --version ]

OPTIONS

       --abort
              Abort  any  pvmove  operations in progress. If a pvmove was started with the --atomic option, then
              all LVs will remain on the source PV.  Otherwise, segments that have been moved will remain on the
              destination PV, while unmoved segments will remain on the source PV.

       --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit
              Determines  the allocation policy when a command needs to allocate Physical Extents (PEs) from the
              VG. Each VG and LV has an allocation policy  which  can  be  changed  with  vgchange/lvchange,  or
              overridden  on  the  command line.  normal applies common sense rules such as not placing parallel
              stripes on the same PV.  inherit applies the VG policy to an LV.  contiguous requires new  PEs  be
              placed  adjacent to existing PEs.  cling places new PEs on the same PV as existing PEs in the same
              stripe of the LV.  If there are sufficient PEs for an allocation, but normal does  not  use  them,
              anywhere will use them even if it reduces performance, e.g. by placing two stripes on the same PV.
              Optional positional PV args on the command line can also be used to limit which  PVs  the  command
              will use for allocation.  See lvm(8) for more information about allocation.

       --atomic
              Makes  a  pvmove operation atomic, ensuring that all affected LVs are moved to the destination PV,
              or none are if the operation is aborted.

       -A|--autobackup y|n
              Specifies if metadata should be backed up automatically after a change.  Enabling this is strongly
              advised! See vgcfgbackup(8) for more information.

       -b|--background
              If  the  operation requires polling, this option causes the command to return before the operation
              is complete, and polling is done in the background.

       --commandprofile String
              The command profile to use for command configuration.  See lvm.conf(5) for more information  about
              profiles.

       --config String
              Config  settings  for  the  command. These override lvm.conf(5) settings.  The String arg uses the
              same format as lvm.conf(5), or may use section/field syntax.  See lvm.conf(5) for more information
              about config.

       -d|--debug ...
              Set  debug level. Repeat from 1 to 6 times to increase the detail of messages sent to the log file
              and/or syslog (if configured).

       --devices PV
              Restricts the devices that are visible and accessible to the command.   Devices  not  listed  will
              appear  to  be missing. This option can be repeated, or accepts a comma separated list of devices.
              This overrides the devices file.

       --devicesfile String
              A file listing devices that LVM should use.  The file  must  exist  in  /etc/lvm/devices/  and  is
              managed  with  the  lvmdevices(8) command.  This overrides the lvm.conf(5) devices/devicesfile and
              devices/use_devicesfile settings.

       --driverloaded y|n
              If set to no, the command will not attempt to use device-mapper.  For testing and debugging.

       -h|--help
              Display help text.

       -i|--interval Number
              Report progress at regular intervals.

       --journal String
              Record information in the systemd journal.  This information is in addition to information enabled
              by  the  lvm.conf  log/journal  setting.   command: record information about the command.  output:
              record the default command output.  debug: record full command debugging.

       --lockopt String
              Used to pass options for special cases to lvmlockd.  See lvmlockd(8) for more information.

       --longhelp
              Display long help text.

       -n|--name String
              Move only the extents belonging to the named LV.

       --nohints
              Do not use the hints file to locate devices for PVs. A command may read more devices to  find  PVs
              when  hints  are  not  used.  The command will still perform standard hint file invalidation where
              appropriate.

       --nolocking
              Disable locking. Use with caution, concurrent commands may produce incorrect results.

       --noudevsync
              Disables udev synchronization. The process will not wait  for  notification  from  udev.  It  will
              continue  irrespective of any possible udev processing in the background. Only use this if udev is
              not running or has rules that ignore the devices LVM creates.

       --profile String
              An alias for --commandprofile or --metadataprofile, depending on the command.

       -q|--quiet ...
              Suppress output and log messages. Overrides --debug and --verbose.  Repeat once to  also  suppress
              any prompts with answer 'no'.

       --reportformat basic|json|json_std
              Overrides  current output format for reports which is defined globally by the report/output_format
              setting in lvm.conf(5).  basic is the original format with columns and rows.   If  there  is  more
              than one report per command, each report is prefixed with the report name for identification. json
              produces report output in JSON format. json_std produces report output in  JSON  format  which  is
              more compliant with JSON standard.  See lvmreport(7) for more information.

       -t|--test
              Run  in  test  mode.  Commands  will  not  update  metadata.  This is implemented by disabling all
              metadata writing but nevertheless returning success to the calling  function.  This  may  lead  to
              unusual  error  messages  in  multi-stage  operations if a tool relies on reading back metadata it
              believes has changed but hasn't.

       -v|--verbose ...
              Set verbose level. Repeat from 1 to 4 times to increase the detail of messages sent to stdout  and
              stderr.

       --version
              Display version information.

       -y|--yes
              Do  not  prompt  for confirmation interactively but always assume the answer yes. Use with extreme
              caution.  (For automatic no, see -qq.)

VARIABLES

       PV     Physical Volume name, a device path under /dev.  For commands  managing  physical  extents,  a  PV
              positional  arg  generally  accepts  a  suffix indicating a range (or multiple ranges) of physical
              extents (PEs). When the first PE is omitted, it defaults to the start of the device, and when  the
              last  PE is omitted it defaults to end.  Start and end range (inclusive): PV[:PE-PE]...  Start and
              length range (counting from 0): PV[:PE+PE]...

       String See the option description for information about the string content.

       Size[UNIT]
              Size is an input number that accepts an optional unit.  Input units are always treated as base two
              values, regardless of capitalization, e.g. 'k' and 'K' both refer to 1024.  The default input unit
              is specified by letter, followed by |UNIT.  UNIT represents other possible  input  units:  b|B  is
              bytes,  s|S  is  sectors of 512 bytes, k|K is KiB, m|M is MiB, g|G is GiB, t|T is TiB, p|P is PiB,
              e|E is EiB.  (This should not be confused with the output control --units, where  capital  letters
              mean multiple of 1000.)

ENVIRONMENT VARIABLES

       See  lvm(8)  for  information  about  environment  variables  used  by lvm.  For example, LVM_VG_NAME can
       generally be substituted for a required VG parameter.

NOTES

       pvmove works as follows:

       1. A temporary 'pvmove' LV is created to store details of all the data movements required.

       2. Every LV in the VG is searched for contiguous data that need moving  according  to  the  command  line
       arguments.   For  each  piece  of  data  found, a new segment is added to the end of the pvmove LV.  This
       segment takes the form of a temporary mirror to copy the data from  the  original  location  to  a  newly
       allocated  location.  The original LV is updated to use the new temporary mirror segment in the pvmove LV
       instead of accessing the data directly.

       3. The VG metadata is updated on disk.

       4. The first segment of the pvmove LV is activated and starts to mirror the first part of the data.  Only
       one segment is mirrored at once as this is usually more efficient.

       5.  A  daemon  repeatedly checks progress at the specified time interval.  When it detects that the first
       temporary mirror is in sync, it breaks that mirror so that only the new location for that data gets  used
       and  writes a checkpoint into the VG metadata on disk.  Then it activates the mirror for the next segment
       of the pvmove LV.

       6. When there are no more segments left to be mirrored, the temporary LV is removed and the  VG  metadata
       is updated so that the LVs reflect the new data locations.

       Note  that  this  new process cannot support the original LVM1 type of on-disk metadata.  Metadata can be
       converted using vgconvert(8).

       If the --atomic option is used, a slightly different approach is used for the move.  Again,  a  temporary
       'pvmove'  LV  is  created  to  store  the  details of all the data movements required.  This temporary LV
       contains all the segments of the various LVs that need to be moved.  However, in this case, an  identical
       LV  is  allocated  that contains the same number of segments and a mirror is created to copy the contents
       from the first temporary LV to the second.  After a complete copy is made, the temporary LVs are removed,
       leaving  behind the segments on the destination PV.  If an abort is issued during the move, all LVs being
       moved will remain on the source PV.

EXAMPLES

       Move all physical extents that are used by simple LVs on  the  specified  PV  to  free  physical  extents
       elsewhere in the VG.
       pvmove /dev/sdb1

       Use a specific destination PV when moving physical extents.
       pvmove /dev/sdb1 /dev/sdc1

       Move extents belonging to a single LV.
       pvmove -n lvol1 /dev/sdb1 /dev/sdc1

       Rather  than moving the contents of an entire device, it is possible to move a range of physical extents,
       for example numbers 1000 to 1999 inclusive on the specified PV.
       pvmove /dev/sdb1:1000-1999

       A range of physical extents to move can be specified as start+length. For example, starting from PE 1000.
       (Counting starts from 0, so this refers to the 1001st to the 2000th PE inclusive.)
       pvmove /dev/sdb1:1000+1000

       Move a range of physical extents to a specific PV (which must have sufficient free extents).
       pvmove /dev/sdb1:1000-1999 /dev/sdc1

       Move a range of physical extents to specific new extents on a new PV.
       pvmove /dev/sdb1:1000-1999 /dev/sdc1:0-999

       If the source and destination are on the same disk, the anywhere allocation policy is needed.
       pvmove --alloc anywhere /dev/sdb1:1000-1999 /dev/sdb1:0-999

       The part of a specific LV present within in a range of physical extents can also be picked out and moved.
       pvmove -n lvol1 /dev/sdb1:1000-1999 /dev/sdc1

SEE ALSO

       lvm(8), lvm.conf(5), lvmconfig(8), lvmdevices(8),

       pvchange(8), pvck(8), pvcreate(8), pvdisplay(8), pvmove(8), pvremove(8), pvresize(8), pvs(8), pvscan(8),

       vgcfgbackup(8), vgcfgrestore(8), vgchange(8), vgck(8), vgcreate(8), vgconvert(8), vgdisplay(8),
       vgexport(8), vgextend(8), vgimport(8), vgimportclone(8), vgimportdevices(8), vgmerge(8), vgmknodes(8),
       vgreduce(8), vgremove(8), vgrename(8), vgs(8), vgscan(8), vgsplit(8),

       lvcreate(8), lvchange(8), lvconvert(8), lvdisplay(8), lvextend(8), lvreduce(8), lvremove(8), lvrename(8),
       lvresize(8), lvs(8), lvscan(8),

       lvm-fullreport(8), lvm-lvpoll(8), blkdeactivate(8), lvmdump(8),

       dmeventd(8), lvmpolld(8), lvmlockd(8), lvmlockctl(8), cmirrord(8), lvmdbusd(8), fsadm(8),

       lvmsystemid(7), lvmreport(7), lvmcache(7), lvmraid(7), lvmthin(7), lvmvdo(7), lvmautoactivation(7)