Re: how to do/repair a raid1 missing disk install (was: Re: lilo + raid = disaster (again))
On Fri, 26 Mar 2004, Antony Gelberg wrote:
> sector, and I'm tired of it. If you don't have time to make it into a
> howto, let me know and I'll do it.
Please do it :-) I lack the time to write (and maintain) such a howto.
> At this point, I have managed to recover to the point where I'm booting
> off /dev/hda, and mounted /dev/md0 as /. I've changed the partition
> type of /dev/hda1 to fd, and added it. My raid array is now syncing
> nicely.
So, I believe all partitions that make part of the RAID array are now
of type 0xFD, correct?
> However, lilo -tv reports:
> Warning: using BIOS device code 0x80 for RAID boot blocks
Ignore. This is what you want for any new BIOS, and for all SCSI BIOSes.
> Warning: /dev/hdc is not on the first disk
This is usual lilo braindamage. Ignore it. /dev/hdc will become the
first disk if /dev/hda goes kaput (and your BIOS isn't crap from 5 years
ago).
> Fatal: map file must be on the boot RAID partition
Well, /boot (or wherever your map file AND kernel happens to live) must be
in /dev/md0 for boot=/dev/md0 to work :)
Other than that, make sure you are using a new enough LILO. The one in
Debian testing should be OK. The one in stable probably isn't, although
if that's the case, I wonder why it didn't bork on raid-extra-boot=mbr-only...
> Is this because the array hasn't finished syncing, or is something
> sinister going on?
Something sinister is going on. You should get something like this:
Warning: /dev/sdb is not on the first disk
The Master boot record of /dev/sdb has been updated.
The Master boot record of /dev/sda has been updated.
(I use SATA with libata, and thus my disks show up as SCSI disks).
> I do have a system where I don't have the raid-extra-boot line in there,
> and it works great. Why could this be? Am I living on the edge with
> that box?
You only have a LILO loader in the first disk of that system, so yes,
you are living on the edge :-)
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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