Re: [gentoo-user] fixing raid1 /boot

[Mike Kazantsev <mk.fraggod@gmail.com>]

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On Wed, 19 Aug 2009 15:30:46 -0700 (PDT)
Kevin Haddock <kevinhaddock@yahoo.com> wrote:

> beta ~ # /sbin/mdadm /dev/md0 --fail /dev/sdb1 --remove /dev/sdb1
> mdadm: cannot get array info for /dev/md0
> beta ~ # cat /proc/mdstat 
> Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
> md0 : inactive dm-0[0](S)
>       104320 blocks super non-persistent

If you have /dev/sda1 and /dev/sdb1 in raid1, "md0 : inactive
dm-0[0](S)" line is obviously wrong, it should be something like
"md0 : active raid1 sda1[0] sdb1[1]".

So, what's this dm-0 device?
Prehaps you had sda/sdb linked via device mapper during boot?

Try removing md0 (by "--manage --stop") and re-assemble the raid,
specifying the correct devices.

Try to remove md0 and re-create it, specifying the right devices (or
just /dev/sda1, then add sdb1).
Alternatively, you can try --assemble --scan, maybe it'll just work
now, then I guess something wrong should be happening during boot.

-- 
Mike Kazantsev // fraggod.net

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