Re: How to make a shadowed system disk

From: Keith A. Lewis (lewis_at_PROBE.mitre.org)
Date: 05/21/03 

Date: Wed, 21 May 2003 18:13:22 +0000 (UTC)

"Scott Greig" <jsgreig@geminaq.com> writes in article <R2Lya.3333$cq1.526543@news20.bellglobal.com> dated Wed, 21 May 2003 09:24:44 -0400:
>A few questions on volume shadowing
>
>1) I can't seem to find out how to make a shadowed system disk.

It's in the manuals. I don't remember which one, maybe "Volume Shadowing
for OpenVMS".

>Is it as simple as:
>
>$ MCR SYSGEN
>USE CURRENT
>SET SHADOW_SYS_DISK=1
>SET SHADOW_SYS_UNIT= whatever
>WRITE CURRENT
>EXIT
>
>....and then reboot?
>
>One rebooted, add other volume(s) to the shadow set?

Yes, pretty much. Use SHADOW_SYS_DISK=4097 to enable mini-merge on that
volume. As with any shadow member, you need a non-zero ALLOCLASS.

>2) What setting changes (if any) need to be/ can be
>made to the console variable BOOTDEF_DEV?
>Can this variable be a list of members of a shadowset?

AFAIK, lists are not supported in SRM. You boot the system from a physical
device, and it mounts as a shadow set at some point during the boot process.

--Keith Lewis klewis$mitre.org
The above may not (yet) represent the opinions of my employer.

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