Red Hat GLOBAL FILE SYSTEM 5.0, Руководство администратора

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The
pvmove
command breaks up the data to be moved into sections and creates a temporary
mirror to move each section. For more information on the operation of the
pvmove
command,
see the
pvmove
(8) man page.
Because the
pvmove
command uses mirroring, it is not cluster-aware and needs exclusive
access to a volume. For information on activating logical volumes on individual nodes in a
cluster, see Section 8, “Activating Logical Volumes on Individual Nodes in a Cluster” .
The following command moves all allocated space off the physical volume
/dev/sdc1
to other
free physical volumes in the volume group:
pvmove /dev/sdc1
The following command moves just the extents of the logical volume
MyLV
.
pvmove -n MyLV /dev/sdc1
Since the
pvmove
command can take a long time to execute, you may want to run the command
in the background to avoid display of progress updates in the foreground. The following
command moves all extents allocated to to the physical volume
/dev/sdc1
over to
/dev/sdf1
in the background.
pvmove -b /dev/sdc1 /dev/sdf1
The following command reports the progress of the move as a percentage at five second
intervals.
pvmove -i5 /dev/sdd1
8. Activating Logical Volumes on Individual Nodes in a
Cluster
If you have LVM installed in a cluster environment, you may at times need to activate logical
volumes exclusively on one node. For example, the
pvmove
command is not cluster-aware and
needs exclusive access to a volume. LVM snapshots require exclusive access to a volume as
well.
To activate logical volumes exclusively on one node, use the
lvchange -aey
command.
Alternatively, you can use
lvchange -aly
command to activate logical volumes only on the
local node but not exclusively. You can later activate them on additional nodes concurrently.
Chapter 4. LVM Administration with CLI Commands
46