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Monday, March 14, 2011

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Activating a VG when quorum is lost

Posted: 14 Mar 2011 01:55 AM PDT

Normally, volume groups are automatically activated during system startup. Unless you intentionally deactivate a volume group using vgchange, you will probably not need to reactivate a volume group.
However, LVM does require that a "quorum" of disks in a volume group be available. During normal system operation, LVM needs a quorum of more than half of the disks in a volume group for activation. If, during run time, a disk fails and causes quorum to be lost, LVM alerts you with a message to the console, but keeps the volume group active.

If there is no other way to make a quorum available, the -q option to the vgchange command will override the quorum check.

EXAMPLE:
vgchange -a y -q n /dev/vg01

 When you replace a disk that was not online when you originally activated the volume group, use the activation command again to attach the now accessible disks to the volume group.

EXAMPLE:
vgchange -a y /dev/vg01
======================================================== By Shiroy Pigarez
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