pvmove(8)



PVMOVE(8)                   System Manager's Manual                  PVMOVE(8)

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 spec-
       ified) extents on the destination PV. If no destination  PV  is  speci-
       fied, 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  al-
       ready  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 ]
           [ 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 ]
           [    --driverloaded y|n ]
           [    --lockopt String ]
           [    --longhelp ]
           [    --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 allo-
              cate Physical Extents (PEs) from the VG. Each VG and LV has an
              allocation policy which can be changed with vgchange/lvchange,
              or overriden on the command line.  normal applies common sense
              rules such as not placing parallel stripes on the same PV.  in-
              herit 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 infor-
              mation 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 com-
              mand 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 set-
              tings.  The String arg uses the same format as lvm.conf, 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).

       --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.

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

       --longhelp
              Display long help text.

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

       --nolocking
              Disable locking.

       --noudevsync
              Disables udev synchronisation. The process will not wait for no-
              tification from udev. It will continue irrespective of any pos-
              sible 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 --ver-
              bose.  Repeat once to also suppress any prompts with answer
              'no'.

       --reportformat basic|json
              Overrides current output format for reports which is defined
              globally by the report/output_format setting in lvm.conf.  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. 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 un-
              usual 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 de-
              tail 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 ex-
              tents (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 con-
              tent.

       Size[UNIT]
              Size is an input number that accepts an  optional  unit.   Input
              units are always treated as base two values, regardless of capi-
              talization, e.g. 'k' and 'K' both refer to  1024.   The  default
              input unit is specified by letter, followed by |UNIT.  UNIT rep-
              resents other possible input units:  bBsSkKmMgGtTpPeE.   b|B  is
              bytes,  s|S  is  sectors  of 512 bytes, k|K is kilobytes, m|M is
              megabytes, g|G is gigabytes, t|T is terabytes, p|P is petabytes,
              e|E  is  exabytes.  (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 loca-
       tion  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  tempo-
       rary  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 in-
       clusive 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 suf-
       ficient 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 allo-
       cation 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)

       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)  vgcon-
       vert(8)  vgdisplay(8)  vgexport(8)  vgextend(8)  vgimport(8)  vgimport-
       clone(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) lvre-
       duce(8) lvremove(8) lvrename(8) lvresize(8) lvs(8) lvscan(8)

       lvm-fullreport(8) lvm-lvpoll(8) lvm2-activation-generator(8) blkdeacti-
       vate(8) lvmdump(8)

       dmeventd(8)  lvmpolld(8)  lvmlockd(8)  lvmlockctl(8)  cmirrord(8) lvmd-
       busd(8)

       lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7)

Red Hat, Inc.          LVM TOOLS 2.03.07(2) (2019-11-30)             PVMOVE(8)

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