PVMOVE(8)						      System Manager's Manual							 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]...] [DestinationPhysicalVolume[:PE[-PE]...]...]]

DESCRIPTION

       pvmove allows you to move the allocated physical extents (PEs) on SourcePhysicalVolume 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
       DestinationPhysicalVolume(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.  Alternatively 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 SourcePhysicalVolume instead of all allocated extents to the destination phys-
	      ical 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 run-
       time 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)