RE: Software RAID FAILED!

What's the hardware?

Software raid, grrrrr....

--eddie

>From: Damien Hull <dhull@digitaloverload.net>
>To: aklug@aklug.org
>Subject: Software RAID FAILED!
>Date: Mon, 24 Apr 2006 11:09:56 -0800
>
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>Last week I had a software RAID 1 set fail. It's working now but I am
>wondering what went wrong. I also want to know why I was unable to reboot.
>
>WHAT I'VE GOT
>1. CentOS 4.2
>2. /dev/md0 = boot, ext3
>3. /dev/md1 = LVM, ext3, everything else
>
>When I tried to reboot I got something like "Grub loading stage 2". Then
>it went into a grub command shell. I tried booting off one drive and
>then the other. One gave me the above message "Grub loading stage 2" and
>the other gave me a screen of "grub, grub, grub etc..."
>
>After a few hours of pocking this and that I was able to find some info
>on the net. I had to boot the CentOS CD and go into rescue mode. I
>manually setup RAID and rebuilt /dev/md0 and /dev/md1. The system is now
>up and running.
>
>QUESTIONS
>1. Why did it fail ( drives seem to be fine )
>2. Why didn't the system reboot from /dev/md0
>3. Shouldn't one drive still work after something goes wrong?
>
>Question 2 is my big problem. If /boot is on /dev/md0 (RAID1), why
>didn't the system boot?
>
>Adam suggested manually installing grub on both drives. This would
>suggest that placing /boot on RAID doesn't work. That grub either didn't
>get installed on one of the drives or it doesn't know what to do with
>/dev/md0.
>
>Again, I didn't get a boot menu. I got a grub shell off one drive and
>the other just gave me a bunch of grub junk.
>
>Question 3 is also a problem. Why use software RAID 1 if both drives
>won't boot when something goes wrong?
>
>If anyone has anything to add let me know. I'll be searching Google and
>my system log's for answers. I hope to have some of this figured out by
>Friday.
>- --
>You can get my public PGP key at https://keyserver.pgp.com
>http://www.digitaloverload.net
>-----BEGIN PGP SIGNATURE-----
>Version: GnuPG v1.2.7 (GNU/Linux)
>Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org
>
>iD8DBQFETSKD+rNhalK/8UURAlXCAKCM/V958rp+T8a3K/u1Of0ezZfV3ACcDkCS
>IUJptJZVgKAbczZYESu8WAo=
>=CDxy
>-----END PGP SIGNATURE-----
>---------
>To unsubscribe, send email to <aklug-request@aklug.org>
>with 'unsubscribe' in the message body.
>

---------
To unsubscribe, send email to <aklug-request@aklug.org>
with 'unsubscribe' in the message body.
Received on Mon Apr 24 11:27:08 2006