Quorum

[ashishm]

What is Quorum in HP ux?

[Robert-Jan Goossens]

Hi,

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Normally, volume groups are automatically activated during system startup. Unless you intentionally deactivate a volume group using vgchange, you will probably not need to activate a volume group. However, LVM does require that a quorum of disks in a volume group be available. During bootup, LVM needs a quorum of more than half of the disks that are included in the root volume group for activation of that volume group; this means the majority of these disks must be online and in service. Thus, if there are two disks in the root volume group, the more than half requirement means that both will need to be available. To successfully boot the system, LVM will require a quorum of one more than half of the disks in the root volume group.
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http://docs.hp.com/en/B2355-90950/ch06s01.html

Regards,
Robert-Jan

[Pete Randall]

See the man page for vgchange. Normally quorum is required but this can be over-ridden with the "-q n" option of vgchange.


Pete

[James R. Ferguson]

Hi:

"Quorum" refers to the minimum number of physical disk comprising a volume group (vg)that must be available at the time the volume group is activated by LVM. This requirement insures that an active volume group has enough members to guarantee a complete configuration.

Regards!

...JRF...

[Peter Godron]

Hi,
similar setup available at server (cluster) level.
For further details start at:
http://docs.hp.com/en/B3936-90065/ch04s04.html