MCSG in a Compaq HSV110 SAN.

[Suren Selva]

Hello All,

We have a Compaq HSV110 (SAN) Disk Array. This SAN is connected to an HP-UX 11.00 Unix system via Securepath. I am trying to setup an MC Serviceguard cluster with the shared VG (vg01) being in the SAN.

The SAN does not support MCSG. When I tried to mark the VG as a cluster aware VG with the 'vgchange -c y vg01', I got an error message stating that "cluster services were unavailable".

Are there any ideas on how to avoid the shared VG from being activated on both systems? Does anyone know of any whitepapers, technical papers that gives info on setting up a cluster with a Compaq SAN?

Thanks in advance to all replies.

Regards,
Suren Selva

[Sridhar Bhaskarla]

Hi Suren,

"cluster services were unavailable" is not because your SAN does not support MCSG. You will have to have the cluster up and running to use vgchange -c y option.

You should be alright as long as you successfully see the disks on both the systems.

-Sri

[Suren Selva]

We were told by Compaq that the HSV110 array did not support MCSG. Could it be because the SAN does not accomodate floating package names that are not the fixed hostnames?

Thanks,
Suren

[Sridhar Bhaskarla]

Hi Suren,

I don't know how your SAN works.

From the ServiceGuard perspective, as long as both systems can see a common set of disks, you can setup serviceguard.

I do not think floating IP/hostname would come into picture while binding the LUNs to the systems from the array but as I mentioned, I do not have true SAN experience yet.

-Sri

[Eugeny Brychkov · Accepted solution]

Is this HSV110 within Enterprise Virtual Array? See http://h18006.www1.hp.com/products/storageworks/enterprise/documentation.html , document 'hpux kit 2.0 installation and config guide' and its release notes (at the page bottom). It states:
"HP-UX Kit V2.0 for Enterprise Virtual Array now supports HP MC/ServiceGuard clustering and Oracle configurations. Ensure that you are running with Enterprise Virtual Array VCS code 2.002 and Secure Path Version 3.0A SP1 for HP-UX to support these options"
Eugeny

[melvyn burnard]

If the HSV is part of an EVA-v2 solution, then this is supported in MC/SG at a minimum of 11.13 version.
The reason you got the eror message is because there was no cluster activity running on hte node you issued the command, namely cmcld was not running.