From owner-freebsd-questions  Fri Sep  1  2: 4: 1 2000
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Date: Fri, 01 Sep 2000 11:03:52 +0200 (CEST)
From: Micke Josefsson <mj@isy.liu.se>
To: David Larkin <David.Larkin@djl.co.uk>
Subject: RE: Disk Backup (Mirroring ?)
Cc: questions@FreeBSD.ORG
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On 31-Aug-00 David Larkin wrote:
> Hi,
> 
> I've recently installed 4.0.
> 
> The machine has 2 identical disks
> 
> ad0: 9768MB <ST310212A> [19846/16/63] at ata0-master using UDMA33
> ad1: 9768MB <ST310212A> [19846/16/63] at ata0-slave using UDMA33
> 
> I've installed FreeBSD on ad0, and ad1 is a virgin disk.
> 
> I want to periodically back up ad0 to ad1 so that if ad0 goes pop,
> I simply swap them around, reboot, and I'm up and running again,
> even if it is a week or two out of date.
> 
> I'm pretty sure I saw a way of doing this on the mailing list a while
> ago, that was why I bought the 2 identical disks.
> 
> I can't find this solution now. I keep finding references to vinum,
> which
> I'm not sure I really need.

vinum works great for this and is not really that tricky to setup. The positive
side is that you do not need to reboot when a disk fails, vinum keeps reading
from the other disk. You will a reboot when installing a new disk I believe.

Apart from that I *think* you can use rdist (man rdist(1)) if you want to do it
'manually'.

/Micke

PS. If going the vinum way, read what to do when having to replace a faulty
disk. You have to manually regenerate the new disk from the old disk's contents
etc.



----------------------------------
Michael Josefsson, MSEE
mj@isy.liu.se

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