LVM Volume Group Quiesce/Resume

Commands
vgchange
The vgchange command provides the –Q and –R options to allow quiescing and
resuming the volume group:
vgchange –Q quiesce_mode [-t quiesce_time] vgname
vgchange -R vg_name
Quiescing a volume group - quiescing application reads and writes
vgchange –Q rw vgname
Using the rw quiesce_mode quiesces application reads and writes and LVM metadata
updates to the volume group.
Quiescing a volume group - quiescing application writes (allowing reads)
vgchange –Q w vgname
Using the w quiesce_mode quiesces application writes and LVM metadata updates to
the volume group but allows application reads. This option can be used to keep
applications available for reading while the snapshot/backup is in progress.
Resuming normal volume group activity
vgchange –R vgname
The vgchange command provides a new –R option that causes a quiesced volume group
to resume normal activity. Aside from displaying volume group and logical volume
information this is the only command allowed when a volume group is quiesced.
Automatically resuming a volume group
vgchange –Q quiesce_mode –t quiesce_time vgname
The vgchange command provides a new –t quiesce_time parameter (to be used with the
–Q option) to automatically resume normal volume group activity after the specified
quiesce_time interval (in seconds) has elapsed. The volume group can be resumed
manually any time before the timeout expires.
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