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       pvmove - move physical extents


       pvmove    [--abort]    [--alloc   AllocationPolicy]   [-b|--background]
       [-d|--debug]   [-h|--help]   [-i|--interval   Seconds]   [--noudevsync]
       [-v|--verbose]                 [-n|--name                LogicalVolume]


       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
       specifed, 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

       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
       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 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).


              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
              SourcePhysicalVolume instead of all  allocated  extents  to  the
              destination physical volume(s).


       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


       lvm(8), vgconvert(8)