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From: David K Phinney <dphinney@dowco.com>
Message-Id: <199803030107.RAA20176@lithium.dowco.com>
Subject: Redundant root/boot disk
To: freebsd-questions@FreeBSD.ORG
Date: Mon, 2 Mar 1998 17:07:00 -0800 (PST)
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Hello,

I just installed a second disk in a machine, and while I was at it I
thought I'd setup a redundant root partition on it and make it bootable
so I can have a backup if the primary disk becomes unbootable.

The primary disk is IDE (wd0), while the new disk is SCSI (sd0). I
have created a small partition on sd0a and copied /kernel, /stand,
/bin, /etc, /tmp and /sbin into it. (I can mount the partitions on
sd0 without problems.)

I can boot by manually typing 1:sd(0,a)kernel from the `boot:' prompt,
but the machine seems to stop at the line `changing root device to sd0'
(it gets through the device detection and such up to that point).

I haven't built a special kernel for the second disk or anything, and
was wondering if maybe the line `config kernel root on wd0a' in my
kernel config might be causing a problem?

Anyways, I guess I was wondering what `officially' I have to do to
setup a second boot/root disk on a machine (what directories need
to be copied, what kernel options need to be set?).

Thanks in advance for your help, please email me directly.


--dave
David K. Phinney
Systems/Network Manager                                 (604) 606-5728
dowco.com internet                                      dave@dowco.com

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