topic Re: procedure to move quurom disk to another disk in OpenVMS in Operating System - OpenVMS

procedure to move quurom disk to another disk in OpenVMS

sartur — Tue, 23 Jan 2007 12:50:46 GMT

We have a 2 nodes OpenVMS Cluster ( 7.3-2 ) with the quorum disk in a old HSZ Disk Storage.
We want to move the quorum disk to another disk in a SAN ( EVA5000 )
Who are the better and more sure method in order to make it?

Re: procedure to move quurom disk to another disk in OpenVMS

Volker Halle — Tue, 23 Jan 2007 12:54:57 GMT

Arturo,

assuming the standard setup of 1 vote for each node and 1 vote for the quorum disk (i.e. excpected_votes=3):

- change the DISK_QUORUM name in MODPARAMS.DAT and run AUTOGEN up to the SETPARAMS phase

- then do a shutdown with CLUSTER_REBOOT option specified.

- the MOUNT the new quorum disk and VMS will automatically create the QUORUM.DAT file (BOTH nodes need to be up to do this).

Volker.

Re: procedure to move quurom disk to another disk in OpenVMS

comarow — Wed, 24 Jan 2007 00:50:04 GMT

Not to disagree with a word Volker says,
but since this parameter doesn't really effect any other, you can just make the changes
in sysgen. That said, make sure you also
make the change in modparams.dat so you don't lose the changes when you run autogen (like for an upgrade).

An important concept is, you must do a complete cluster shutdown, as Volker pointed out, because you can't at any time have two quorum disks defined in a cluster.

On the first boot, it will not at first use
the quorum disk vote, so as pointed out, you will need to boot both nodes to have enough votes to boot.

The only supported way to create quorum.dat is through a boot, and not by copying the file. Why? Dunno. Sometimes it works, and sometimes it works strangely if you copy or backup that file.

Have fun.

Re: procedure to move quurom disk to another disk in OpenVMS

John Abbott_2 — Wed, 24 Jan 2007 06:56:24 GMT

Just a couple of notes:

When you boot the systems, make sure you don't boot them minimum as the quorum file will not be created. Also make sure the new quorum disk is mounted in your startup script.

Re: procedure to move quurom disk to another disk in OpenVMS

sartur — Wed, 24 Jan 2007 12:01:59 GMT