what state must be the VG lock ?

[Jdamian]

Hi

In my cluster I defined a VG lock. That VG has just one PV and holds no service (it is included in no package).

That VG must be activated always as /dev/vg00 and other non-cluster VGs (/etc/lvmrc)?

Must it be deactivated and SG will activate when necessary?

I'm a mess

[Torsten.]

The cluster lock VG could be a "normal" but shared VG. The information is set in the VG configuration area. You may use a "unused" VG too, but all servers must have access to it.

[Todd McDaniel_1]

Oscar,

No it doesnt need to be part of any MCSG package nor does it need to be "managed" by SG.

As Torsten said, it only has to be made up of shared disks that can be seen by all boxes in the cluster. Since yours is a VG containing the disk(s) instead of just a cluster lock disk, I believe the VG needs to be defined on all boxes in the cluster.

[Faizer Jameel · Accepted solution]

Hi all

I have been able to start and stop my cluster many times and it works fine with a vg configured with a lock disk shared by both my nodes.

Query for a better understanding.

Does this vg holding the lock disk be in vgactivated mode or not.
[ when I do a vgdisplay it says the vg is not activated] this disk is visible on both he nodes.
Thanks
Faizer

[Todd McDaniel_1]

Oscar,

Here is a great link to a mcsg manual.

http://docs.hp.com/en/B3936-90117/index.html

it is also available in pdf form on that page...

[Kevin Wright]

it does not need to be activated, just cluster awarey.

[Stephen Doud]

I agree with Kevin. The lock VG does not have to be activated for Serviceguard to use it.
Serviceguard does not use the LVM stack when it needs to interact with the cluster lock structure, one the structure is installed using cmapplyconf.

[manish_csc]

Hi,
Cluster lock disk used only to avoid split brain sindrome while there is a node failure.

Cluster lock disk not necessary part of cluster VG.

Thanks

[whiteknight]

The purpose of the cluster lock is to ensure that only one new cluster is
formed in the event that exactly half of the previously clustered nodes
try to form a new cluster. It is critical that only one new cluster is formed
and that it alone has access to the disks specified in its packages. You can
specify either a lock disk or a quorum server as the cluster lock.
A one-node cluster does not require a lock. Two-node clusters require the
use of a cluster lock, but the lock is recommended for larger clusters as
well. Clusters larger than 4 nodes can only use a quorum server as the
cluster lock.

You can outside of non cluster VGs. just treat as normal pv.

[Jdamian]

Thanx everyone