Changing The Parameters Of A Volume Group; Activating And Deactivating Volume Groups; Removing Volume Groups; Splitting A Volume Group - Red Hat ENTERPRISE LINUX 5 - LOGICAL VOLUME MANAGER ADMINISTRATION Manual

Chapter 4. LVM Administration with CLI Commands

4.3.7. Changing the Parameters of a Volume Group

The vgchange command is used to deactivate and activate volume groups, as described in
Section 4.3.8, "Activating and Deactivating Volume Groups". You can also use this command to
change several volume group parameters for an existing volume group.
The following command changes the maximum number of logical volumes of volume group vg00 to
128.
vgchange -l 128 /dev/vg00
For a description of the volume group parameters you can change with the vgchange command, see
the vgchange(8) man page.

4.3.8. Activating and Deactivating Volume Groups

When you create a volume group it is, by default, activated. This means that the logical volumes in
that group are accessible and subject to change.
There are various circumstances for which you you need to make a volume group inactive and
thus unknown to the kernel. To deactivate or activate a volume group, use the -a (--available)
argument of the vgchange command.
The following example deactivates the volume group my_volume_group.
vgchange -a n my_volume_group
If clustered locking is enabled, add 'e' to activate or deactivate a volume group exclusively on one
node or 'l' to activate or/deactivate a volume group only on the local node. Logical volumes with single-
host snapshots are always activated exclusively because they can only be used on one node at once.
You can deactivate individual logical volumes with the lvchange command, as described in
Section 4.4.4, "Changing the Parameters of a Logical Volume Group", For information on activating
Section 4.8, "Activating Logical Volumes on
logical volumes on individual nodes in a cluster, see
Individual Nodes in a Cluster".

4.3.9. Removing Volume Groups

To remove a volume group that contains no logical volumes, use the vgremove command.
# vgremove officevg
Volume group "officevg" successfully removed

4.3.10. Splitting a Volume Group

To split the physical volumes of a volume group and create a new volume group, use the vgsplit
command.
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