On Mon, 3 Apr 2000, Rainer Mager wrote:
> I think my situation is the same as this "two failed disks" one but I
> haven't been following the thread carefully and I just want to double check.
>
> I have a mirrored RAID-1 setup between 2 disks with no spare disks.
> Inadvertantly the machine got powered down without a proper shutdown
> apparently causing the RAID to become unhappy. It would boot to the point
> where it needed to mount root and then would fail saying that it couldn't
> access /dev/md1 because the two RAID disks were out of sync.
> Anyway, given this situation, how can I rebuild my array? Is all it takes
> is doing another mkraid (given the raidtab is identical to the real setup,
> etc)? If so, since I'm also booting off of raid, how do I do this for the
> boot partition? I can boot up using one of the individual disks (e.g.
> /dev/sda1) instead of the raid disk (/dev/md1), but if I do that will I be
> able to do a mkraid on an in-use partition? If not, how do I resolve this
> (boot from floppy?).
> Finally, is there any way to automate this recovery process. That is, if
> the machine is improperly powered down again, can I have it automatically
> rebuild itself the next time it comes up?
>
Whether or not the array is in sync should not make a difference to the
boot process. I have both raid1 and raid 5 systems that run root raid and
will boot quite nicely and rsync automatically after a "dumb" shutdown
that leaves them out of sync.
Do you have your kernel built for auto raid start?? and partitions marked
"fd" ?
You can reconstruct you existing array by booting with a kernel that
supports raid and with the raid tools on the rescue system. Do it all the
time.
Michael
