pvmove man page on NetBSD

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PVMOVE(8)							     PVMOVE(8)

NAME
       pvmove - move physical extents

SYNOPSIS
       pvmove	 [--abort]    [--alloc	 AllocationPolicy]   [-b|--background]
       [-d|--debug]   [-h|--help]   [-i|--interval   Seconds]	[-v|--verbose]
       [-n|--name  LogicalVolume] [SourcePhysicalVolume[:PE[-PE]...] [Destina‐
       tionPhysicalVolume[:PE[-PE]...]...]]

DESCRIPTION
       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‐
       point.

       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).

OPTIONS
       --abort
	      Abort any moves in progress.

       -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).

EXAMPLES
       To move all logical extents of any logical volumes on /dev/hda4 to free
       physical	 extents elsewhere in the volume group, giving verbose runtime
       information, use:

	    pvmove -v /dev/hda4

SEE ALSO
       lvm(8), vgconvert(8)

Sistina Software UK    LVM TOOLS 2.02.44-cvs (02-17-09)		     PVMOVE(8)
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