Hello,
I had to shutdown my machine for moving - when I powered it back up my
raid-5 array is in a bad state:
# mdadm -A -s
mdadm: no devices found for /dev/md0
mdadm: /dev/md/0 assembled from 2 drives - not enough to start the array.
I ended up forcing the assembly:
# mdadm -A -s -f
mdadm: no devices found for /dev/md0
mdadm: forcing event count in /dev/sde(1) from 177 upto 181
mdadm: clearing FAULTY flag for device 1 in /dev/md/0 for /dev/sde
mdadm: /dev/md/0 has been started with 3 drives (out of 4).
Looking at the detailed output the missing disk (/dev/sdc) is "removed":
# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Sat Mar 12 21:22:34 2011
Raid Level : raid5
Array Size : 2197723392 (2095.91 GiB 2250.47 GB)
Used Dev Size : 732574464 (698.64 GiB 750.16 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Tue Jul 19 20:44:45 2011
State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : daf06d5a:b80528b1:2e29483d:f114274d (local to host storage)
Events : 0.181
Number Major Minor RaidDevice State
0 8 80 0 active sync /dev/sdf
1 8 64 1 active sync /dev/sde
2 8 48 2 active sync /dev/sdd
3 0 0 3 removed
I can examine the disk but I'm unable to add it (I don't recall if it
needs to be removed first or not):
# mdadm --examine /dev/sdc
/dev/sdc:
Magic : a92b4efc
Version : 00.90.00
UUID : daf06d5a:b80528b1:2e29483d:f114274d (local to host storage)
Creation Time : Sat Mar 12 21:22:34 2011
Raid Level : raid5
Used Dev Size : 732574464 (698.64 GiB 750.16 GB)
Array Size : 2197723392 (2095.91 GiB 2250.47 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Tue Jul 19 20:44:45 2011
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : 22ac1229 - correct
Events : 181
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 32 3 active sync /dev/sdc
0 0 8 80 0 active sync /dev/sdf
1 1 0 0 1 faulty removed
2 2 8 48 2 active sync /dev/sdd
3 3 8 32 3 active sync /dev/sdc
# mdadm --add /dev/md0 /dev/sdc
mdadm: Cannot open /dev/sdc: Device or resource busy
So a couple questions.
1. Any thoughts on what would cause this? I seem to have bad luck
with my raid arrays whenever I reboot.
2. How do I fix? Everything *seems* to be as it should be . . .
Here is the mdadm.conf:
# cat /etc/mdadm/mdadm.conf | grep -v ^#
DEVICE partitions
CREATE owner=root group=disk mode=0660 auto=yes
HOMEHOST <system>
MAILADDR root
ARRAY /dev/md0 level=raid5 num-devices=4
UUID=11c1cdd8:60ec9a90:2e29483d:f114274d
Any help is greatly appreciated.
Matt
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