F11 dmraid assistance (raid1)

[Michael Cronenworth]

I'm pulling my hair out over a RAID1 setup.

* Two 1TB Seagate 7200.12 drives (sda and sdb)
* RAID1 using Intel OROM.
* Two partitions: /boot partition ext3, LVM2 encrypted partition with /
XFS and swap
* sdb formed a bad sector, I'm going to RMA it.
* There are no other hard drives attached.

First I attempted to shutdown and unplug the bad drive. Fedora wouldn't
boot -- gets to Password: prompt for encrypted partition. Correct
password is entered but the encrypted partition cannot be mounted. I
narrowed it down to that the /dev/sda1 and /dev/sda2 partitions are not
showing up so the kernel can't find the correct UUID from /etc/crypttab
to mount /.

Second, I plugged the bad drive back in. Fedora boots normally.

Third, I get brave and remove the bad drive from the RAID using the
Intel OROM. I then turn off the machine and remove the bad drive. Fedora
won't boot -- gets past password prompt, but during bootup it cannot
find my /boot partition and dumps me to a recovery shell.

Fourthly, I plug the bad drive back in and Fedora boots. The bad drive
is no longer in the RAID, but its old partitions are exposed. The UUID
of /dev/sdb1 matches and so it mounts /boot.

Fifthly, I couldn't get the bad drive to rebuild so I used a Fedora Live
USB install to start the rebuild. Rebooted and Fedora wouldn't boot. No
/dev/sda1 partition and no /dev/sdb1 or /dev/sdb2 partitions!

Now I'm stuck in a loop inbetween the 3rd and 4th attempt at safely
removing the bad drive from my RAID1 array. I only see the following in
/dev:
ls -l /dev/sd*
brw-rw----. 1 root disk 8,  0 2009-11-02 19:16 /dev/sda
brw-rw----. 1 root disk 8,  2 2009-11-02 19:15 /dev/sda2
brw-rw----. 1 root disk 8, 16 2009-11-02 19:16 /dev/sdb
brw-rw----. 1 root disk 8, 17 2009-11-02 19:15 /dev/sdb1
brw-rw----. 1 root disk 8, 18 2009-11-02 19:15 /dev/sdb2

This is with the bad drive not in the array of course. What happened to
my /dev/sda1 partition? Fdisk shows it. Gparted shows it. Linux doesn't!
It is obviously still there as with my bad drive out I can boot. I don't
get it.

Thanks,
Michael

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[Michael Cronenworth]

On 11/02/2009 07:30 PM, Michael Cronenworth wrote:
>
> This is with the bad drive not in the array of course. What happened
> to my /dev/sda1 partition? Fdisk shows it. Gparted shows it. Linux
> doesn't! It is obviously still there as with my bad drive out I can
> boot. I don't get it.
>

Fixed... for now:
/etc/rc.sysinit has its dmraid line set to "--rm_partitions" so I
removed this and I get my /dev/sda1 back. Removed the bad drive and
Fedora boots. Yay.

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