Date: Sat, 26 Jan 2002 13:56:22 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Ian <freebsd@damnhippie.dyndns.org> Cc: Dragon Fire <dragonfire820@mediaone.net>, <freebsd-hackers@FreeBSD.ORG> Subject: Re: Emergency Help Needed Message-ID: <200201262156.g0QLuMp24763@apollo.backplane.com> References: <B8785BB9.96BD%freebsd@damnhippie.dyndns.org>
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:> Hi Folks,
:>
:> I have an emergency and I need some quick help.
:>
:> I just ran boot0cfg to install boot0 as my boot code instead of the standard
:> mbr. This is on a dedicated FreeBSD system. Now the system boots and gives
:> me a choice F4 FreeBSD or F5 Disk 1 both selections hang. I had numerous
:> problems getting 4.4 to boot from the hard disk in the first place because
:> of BIOS disk settings.
:
:I've had a lot of trouble with the mbr since FreeBSD 4.0. The trouble I
:usually run into is when I stick a new scsi drive into a system which is
:unformatted or has who-knows-what on it (like it was formerly in a Mac).
:The adaptec card adds it as "bios drive 1" and then the mbr on drive 0
:detects it and gives me choices of F1 or F5, the latter being the new drive.
:Even if I hit F1 or let it choose that by default, the btx loader crashes.
:If I reboot and use the adaptec bios settings to exclude the new drive from
:the bios drive set, then I can boot off the existing drive and properly
:fdisk and disklabel the new drive so it can be added back to the bios list
:for the next reboot.
I had exactly the same problem... stick in new SCSI disk, btx loader
fault. But for me it turned out to be the fact that I originally
formatted the disks with a dangerously-dedicated partition. When I
reformatted with a normal slice entry things started working again.
If adding a SCSI disk causes the fault but the machine works fine
with just the first SCSI disk, boot with just the first SCSI disk
then plug in the second one *after* the machine has finished booting,
do a 'camcontrol recsan ...' as appropriate, and format your new disk.
If the original SCSI disk is causing the fault it could be because the
original drive was formatted in dangerously-dedicated mode rather then
with a real slice. You may have to unplug the disk and then boot the
machine from the FreeBSD CDRom, then plug the disk back in, do the
camcontrol trick, and mount/backup/reformat/restore the disk. Fun.
-Matt
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