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Date:      Tue, 18 Feb 2003 10:56:16 +0000
From:      Tim Bishop <tim-lists@bishnet.net>
To:        freebsd-stable@freebsd.org
Cc:        T.D.Bishop@ukc.ac.uk
Subject:   FreeBSD Boot Manager rendering disk un-bootable
Message-ID:  <20030218105616.GA569@raq15.uk2net.com>

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Hi,

I'm testing vinum on FreeBSD 4.7 in preparation for building a
server. However, I seem to have come across a problem with the Boot
Manager.

During installation I selected both disks to be entirely FreeBSD, and
both to have the FreeBSD Boot Manager. This all worked fine.

At boot time I got presented with two options; "FreeBSD" and "Drive
1". Selecting "FreeBSD" booted fine. Next time round I selected "Drive
1" and got presented with "FreeBSD" and "Drive 0". I selected "FreeBSD"
and again it booted fine. All going well so far.

Then I tried to boot up normally off the first drive and got told "Not
found any [active partition] in HDD", followed by "DISK BOOT FAILURE,
INSERT SYSTEM DISK AND PRESS ENTER". At this point I figured maybe it
was a disk failure, and this gave me an opportunity to test vinum.

So I swapped the two disks over inside the machine. This booted up fine
on what was now Drive 0 (the old Drive 1). A while later and after a few
more attempts to boot the dead disk I noticed that the Boot Manager would
let me select the supposedly dead "Drive 1". So I did, and then picked
"FreeBSD". The dead disk booted fine, which seemed a little odd.

It then came as a slight shock that the current Drive 0 was rendered
unbootable just like the current Drive 1 was before they were swapped
over. So, I swapped them back to how they originally were and Drive 0
(the original Drive 0) booted. Follow the same procedure again and we're
back in the same state with Drive 0 not booting.

So, to summarise. Boot from Drive 0, select Drive 1 and pick FreeBSD
off Drive 1. This renders Drive 0 unbootable, and seemingly fixes Drive
1 if it was previously unbootable.

Have I found a bug? Or is there something else going wrong here? I
couldn't see anything obviously related in the PR database.

Cheers,
Tim.

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