New RAID-1 System with SuSe 6.1/kernel 2.2.10, 1 ide-hd as boot device,
and 2 9G SCSIs as RAID-1 devices.
escudo:~ # cat /etc/fstab
/dev/hda4 swap swap defaults 0 0
/dev/hda1 / ext2 defaults 1 1
/dev/hda2 /home ext2 defaults 1 2
# RAID-1 DEVICES see /etc/raidtab for more details
/dev/md0 /u01 ext2 defaults 1 2
/dev/md5 /u02 ext2 defaults 1 2
/dev/md6 /u03 ext2 defaults 1 2
/dev/md7 /u04 ext2 defaults 1 2
/dev/md8 /u05 ext2 defaults 1 2
none /proc proc defaults 0 0
none /dev/pts devpts defaults 0 0
Everything was working great. But I wanted to simulate a HD Crash to
see the recovery process. I halted the box, unpluged one of the two
SCSI disks and booted. Everything booted great with the normal error
messages one would expect, and I was able to access my data from the
one live SCSI disk. Re-halted the system, pluged in the 'bad' SCSI
disk.. and Re-booted, to see what would happen. And now this is what
I get:
cudo:~ # cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md8 : active raid1 sda8[0] 2056192 blocks [2/1] [U_]
md7 : active raid1 sda7[0] 2032064 blocks [2/1] [U_]
md6 : active raid1 sda6[0] 2032064 blocks [2/1] [U_]
md5 : active raid1 sda5[0] 2040128 blocks [2/1] [U_]
md0 : active raid1 sda1[0] 722816 blocks [2/1] [U_]
unused devices: <none>
and from 'dmesg':
sda1's event counter: 00000015
md0: max total readahead window set to 128k
md0: 1 data-disks, max readahead per data-disk: 128k
raid1: device sda1 operational as mirror 0
raid1: md0, not all disks are operational -- trying to recover array
raid1: raid set md0 active with 1 out of 2 mirrors
md: updating md0 RAID superblock on device
sda1 [events: 00000016](write) sda1's sb offset: 722816
md: recovery thread got woken up ...
md0: no spare disk to reconstruct array! -- continuing in degraded mode
md: recovery thread finished ...
(I get the same for each raid partition)
>From the above I assume I am still running off of one of the HDs that are
in the array (the one that I did not unplug). Now the questions:
How do I re-sync these RAID devices?
Is it necessary to have a 'spare disk' to be able to recovery my array?
(ie, a partition on the IDE drive could be the spare disk..)
There is documentation on How-to-Setup a RAID, but I can't find much
on one of the more important aspects, how to recover. :) Any URLs I'm
missing?
Any similar tests done by the RAID community, I would like to here your
experiences..
Thanks
--
JT
[EMAIL PROTECTED]
