clone of system disk between two machines

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Date: Mon, 30 Jun 2003 15:16:18 +1000
To: <sunmanagers@sunmanagers.org>

Has anyone had experience of duplicating system disks between two hosts,
especially when using Disksuite on the hosts?

We have a pair of 280R's that are used as a production and a test system. Both
are similarly configured with two internal disks and both connected to an
external D2 cabinet. The production system has mirrored system disks but the
plan is to use one of the internal disks on the test box as a DR set-up so in
the event of the prod system going down we could boot off the spare disk in
the test box and carry on. Both systems use Disksuite for the external disks.
I've successfully cloned the system disk of the test box to its second
internal disk and it booted okay, I rebuilt the disksuite db on this disk to
accomodate the external disks, re-booted - no problems.

The problem occours after syncing the production system disk to the second
disk in the test box. I sync everything using rsync except the /dev and
/devices areas and the /etc/system,/etc/vfstab and /etc/lvm directory. When I
then try to reboot it barfs saying it can't mount / and to do a manual fsck,
if I try this it says it can't find/open /dev/dsk/c1t1d0s0 (my root
partition). I've tried a boot -r , no different....

If I refresh the disk from the test box's original system disk it goes back to
being fine. So what am I overwriting that I shouldn't which would cause this ?
or does anyone else do something similar that works?

Thanks,

Adrian
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