topic VxVM Disks in Operating System - HP-UX

VxVM Disks

Karthik S S — Fri, 18 Oct 2002 06:15:07 GMT

Hi,

We have 2 L-Class systems connected to one SC10 Disk array which has 2 disks. The idea is to configure a cluster using the VxVM Disk layout. On node1 I have created a rootdg and a testdg having one disk each from the SC10. On node2 I have not created any rootdg and I am trying to import both the DGs manually from node1 (after doing a "vxdg deport dgname"). But I am getting the following erroe when I do so,

"vxvm:vxdg: ERROR: Disk group rootdg: import failed: vxconfigd is currently disab
led"

I tried to run vxconfigd in enable mode using "vxconfigd -k" but it give the following error,
"vxvm:vxconfigd: ERROR: enable failed: Error in disk group configuration copies
No valid disk found containing disk group; transactions are disabled."

First of is it possible to import the rootdg from some other system instead of having one locally?

Kindly clarify

Thanks
Karthik

Re: VxVM Disks

melvyn burnard — Fri, 18 Oct 2002 06:35:10 GMT

From the Managing MC/ServiceGuard manual:
The rootdg in the VERITAS Volume Manager is not the same as the HP-UX root disk, and cannot be used for the HP-UX root file system (/). Note also that rootdg cannot be used for shared storage. However, rootdg can be used for other local filesystems (e.g., /export/home), so it need not be wasted.

Note that you should create a root disk group only once on each node.

More information is in this manual at:
http://docs.hp.com/hpux/onlinedocs/B3936-90065/B3936-90065.html

Re: VxVM Disks

Karthik S S — Fri, 18 Oct 2002 07:21:48 GMT

Hi melvyn,

Thanks for the input. I referred the MCSG manual which says that for each and every node in the cluster you should have separate disk configured as rootdg. And also we can't use the VxVM DGs as Cluster lock which means it will work out expensive for VxVM Cluster implementations ( We need a Disk for rootdg on every nodes and a Disk should be shared between both the nodes using LVM for Cluster Lock )....!!!

Thanks
Karthik

Re: VxVM Disks

melvyn burnard — Fri, 18 Oct 2002 09:42:29 GMT

You are correct, this is a costly, complicated scenario.
Also, package switchovers are SLOWER using VxVM, and hence delay package startups.

One suggestion that may help you is that to overcome the cluster lock disc issue, why not take a look at the Quorum Server option, which can be used for SG versions 11.13 and 11.14.
The documentation is available at the same site, and the software is available at http://software.hp.com under the Highg Avavilability section, and is FREE.