pvmove man page on Archlinux

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PVMOVE(8)							     PVMOVE(8)

       pvmove - move physical extents

       pvmove	 [--abort]    [--alloc	 AllocationPolicy]   [-b|--background]
       [-d|--debug]   [-h|--help]   [-i|--interval   Seconds]	[--noudevsync]
       [-v|--verbose]	  [-n|--name	 LogicalVolume]	   [SourcePhysicalVol‐
       ume[:PE[-PE]...]	 [DestinationPhysicalVolume[:PE[-PE]...]...]]

       pvmove allows you to move the allocated physical extents (PEs) on Sour‐
       cePhysicalVolume	 to one or more other physical volumes (PVs).  You can
       optionally specify a source LogicalVolume in which  case	 only  extents
       used  by that LV will be moved to free (or specified) extents on Desti‐
       nationPhysicalVolume(s).	 If no DestinationPhysicalVolume is specified,
       the normal allocation rules for the Volume Group are used.

       If  pvmove  gets	 interrupted for any reason (e.g. the machine crashes)
       then run pvmove again without any PhysicalVolume arguments  to  restart
       any  moves  that	 were  in progress from the last checkpoint.  Alterna‐
       tively use pvmove --abort at any time to abort them at the last	check‐

       You  can run more than one pvmove at once provided they are moving data
       off different SourcePhysicalVolumes, but additional pvmoves will ignore
       any  Logical  Volumes  already in the process of being changed, so some
       data might not get moved.

       pvmove works as follows:

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

       2.  Every Logical Volume in the Volume Group 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 Volume Group metadata is updated on disk.

       4.  The	first  segment	of  the pvmove Logical Volume is activated and
       starts to mirror the first part of the data.  Only one segment is  mir‐
       rored 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 Volume Group 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
       Logical Volume is removed and the Volume Group metadata is  updated  so
       that the Logical Volumes 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).

       See lvm(8) for common options.

	      Abort any moves in progress.

	      Disable udev synchronisation. The	 process  will	not  wait  for
	      notification  from  udev.	  It will continue irrespective of any
	      possible udev processing in the background.  You should only use
	      this if udev is not running or has rules that ignore the devices
	      LVM2 creates.

       -b, --background
	      Run the daemon in the background.

       -i, --interval Seconds
	      Report progress as a percentage at regular intervals.

       -n, --name LogicalVolume
	      Move only the extents belonging to  LogicalVolume	 from  Source‐
	      PhysicalVolume  instead of all allocated extents to the destina‐
	      tion physical volume(s).

       To move all Physical Extents that are used by simple Logical Volumes on
       /dev/sdb1 to free Physical Extents elsewhere in the Volume Group use:

       pvmove /dev/sdb1

       Additionally,  a specific destination device /dev/sdc1 can be specified
       like this:

       pvmove /dev/sdb1 /dev/sdc1

       To perform the action only on extents belonging to the  single  Logical
       Volume lvol1 do this:

       pvmove -n lvol1 /dev/sdb1 /dev/sdc1

       Rather than moving the contents of the entire device, it is possible to
       move a range of Physical Extents - for example  numbers	1000  to  1999
       inclusive on /dev/sdb1 - like this:

       pvmove /dev/sdb1:1000-1999

       A range can also be specified as start+length, so

       pvmove /dev/sdb1:1000+1000

       also refers to 1000 Physical Extents starting from Physical Extent num‐
       ber 1000.  (Counting starts from 0, so this refers to the 1001st to the
       2000th inclusive.)

       To  move a range of Physical Extents to a specific location (which must
       have sufficient free extents) use the form:

       pvmove /dev/sdb1:1000-1999 /dev/sdc1


       pvmove /dev/sdb1:1000-1999 /dev/sdc1:0-999

       If the source and destination are on the same disk, the anywhere	 allo‐
       cation policy would be needed, like this:

       pvmove --alloc anywhere /dev/sdb1:1000-1999 /dev/sdb1:0-999

       The  part  of  a	 specific  Logical Volume present within in a range of
       Physical Extents can also be picked out and moved, like this:

       pvmove -n lvol1 /dev/sdb1:1000-1999 /dev/sdc1

       lvm(8), vgconvert(8) pvs(8)

Sistina Software UK   LVM TOOLS 2.02.106(2) (2014-04-10)	     PVMOVE(8)

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