I wonder if you could help a Raid Newbie with a problem
I had a power fail, and now I can't access my RAID array. It has been
working fine for months until I lost power... Being a fool, I don't have
a full backup, so I really need to get this data back.
I run FC4 (64bit).
I have an array of two disks /dev/sda1 and /dev/sdb1 as a raid5 array
/dev/md0 on top of which I run lvm and mount the whole lot as /home. My
intention was always to add another disk to this array, and I purchased
one yesterday.
When I boot, I get:
md0 is not clean
Cannot start dirty degraded array
failed to run raid set md0
I can provide the following extra information:
# cat /proc/mdstat
Personalities : [raid5]
unused devices: <none>
# mdadm --query /dev/md0
/dev/md0: is an md device which is not active
# mdadm --query /dev/md0
/dev/md0: is an md device which is not active
/dev/md0: is too small to be an md component.
# mdadm --query /dev/sda1
/dev/sda1: is not an md array
/dev/sda1: device 0 in 2 device undetected raid5 md0. Use mdadm
--examine for more detail.
#mdadm --query /dev/sdb1
/dev/sdb1: is not an md array
/dev/sdb1: device 1 in 2 device undetected raid5 md0. Use mdadm
--examine for more detail.
# mdadm --examine /dev/md0
mdadm: /dev/md0 is too small for md
# mdadm --examine /dev/sda1
/dev/sda1:
Magic : a92b4efc
Version : 00.90.02
UUID : c57d50aa:1b3bcabd:ab04d342:6049b3f1
Creation Time : Thu Dec 15 15:29:36 2005
Raid Level : raid5
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Tue Mar 21 06:25:52 2006
State : active
Active Devices : 1
Working Devices : 1
Failed Devices : 2
Spare Devices : 0
Checksum : 2ba99f09 - correct
Events : 0.1498318
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 8 1 0 active sync /dev/sda1
0 0 8 1 0 active sync /dev/sda1
1 1 0 0 1 faulty removed
#mdadm --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 00.90.02
UUID : c57d50aa:1b3bcabd:ab04d342:6049b3f1
Creation Time : Thu Dec 15 15:29:36 2005
Raid Level : raid5
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Tue Mar 21 06:23:57 2006
State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 2ba99e95 - correct
Events : 0.1498307
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 1 8 17 1 active sync /dev/sdb1
0 0 8 1 0 active sync /dev/sda1
1 1 8 17 1 active sync /dev/sdb1
It looks to me like there is no hardware problem, but maybe I am wrong.
I cannot find any file /etc/mdadm.conf nor /etc/raidtab.
How would you suggest I proceed? I'm wary of doing anything (assemble,
build, create) until I am sure it won't reset everything.
Many Thanks
Nigel
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