Running ServiceGuard without a shared VG

[Neil Macvicar_1]

Hi all,
I have 2 HP boxes, but cannot chain them together with the onboard scsi adapters since both adapters are hardwired to ID 7 :/
Is there any way I can get ServiceGuard to run without needing a shared VG ? The packages I intend to cluster do not require shared storage.

Regards.

[Sanjay_6]

Hi Neil,

If you don't configure a shared VG, the package VG will not be able to failover to the other node. This defeats the purpose of SG configuration. Put some addon SCSI cards on the system if you can.

Hope this helps.

regds

[John Palmer]

Certainly. You simply don't have anything in the cluster config file where it says 'VOLUME_GROUP'.

Regards,
John

[A. Clay Stephenson]

Hi:

Because this is a two-node cluster there must be a lock-disk for quorum arbitration. If this were a three-node cluster and thus would not require a cluster lock disk. Your best bet is to add a controller to at least one of your boxes.

[John Palmer]

You only really need a cluster lock to stop both systems activating the same volume group thus causing data corruption.

No shared disks - no possibility of data corruption.

Regards,
John

[melvyn burnard · Accepted solution]

Well the simple answer is yes you can have ServiceGuard running, and have packages, without any VG's at all. many customers in fact do this. The gotcha is that for a two node cluster you currently MUST have a cluster lock disc that is a shared LVM disc.
Out of interest, what are these systems? and why can you not shared discs?

[Neil Macvicar_1]

The systems are an HP 712/100 and an HP Visualise B132L.

The internal SCSI controllers in both machines are set to ID 7. There are no ways to change this physically on the motherboard, and I'm not sure about any other means.

This leaves me with two machines (the gotcha two-node cluster :/) and no means of sharing a VG.

[melvyn burnard]

I had a sneaky suspicion this might be the case.
ServiceGuard is only for series 800 server systems, not 700 Workstations.
You can force the software on, but do not expect any official support for thi sif you get it working.

[Neil Macvicar_1]

Since this is a side project, no I do not expect any support. It's something to put the two spare HP's to use with. ServiceGuard installed fine without any complaints on the 712/100 , and I suspect would work fine also, given access to a VG :)

I think the easiest solution here for me is to aquire another HP box and have a tri-node setup.