Backups and shadowed system disk

From: Hellion (hellion_at_visi.com)
Date: 11/12/03 

Date: 12 Nov 2003 11:51:19 -0800

Hello all,

Question for you regarding backups and shadow sets. I understand from
reading the Volume Shadowing for OpenVMS manual that in order to
guarantee myself a completely good backup of a shadow set, I should
dismount the set, remount it less 1 member, backup the excluded
member, and then re-mount the excluded member to the set.

My question is, how the heck can that work on a system disk? I'm
guessing (haven't verified it, since I don't have a spare VAX to play
with) that dismounting the system disk would cause me a load of
problems that probably would include not being able to re-mount it
since I wouldn't have a system disk to run the OS from at that point.
Though perhaps being in a cluster would mitigate that risk.

I'm also curious if anybody has a nice DCL script for automating the
dismount/split/remount-1/backup/rejoin process for normal disks. I
assume that I also have to make sure that there are no jobs running
that are going to be using the disks during my attempt to
dismount/remount them.

In case it matters, my system specs:
VAX 4100A clustered with VAX 4108, both running VMS 7.2
4100A system shadow set is 3 RF35 disks
4108 system shadow set is 2 RZ40 disks.

Elliott
-------------------

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