Hi. I hope someone can tell me what I have done wrong. I have a 4 disk
Raid 5 array running on Fedora9. I've run this array for 2.5 years with
no issues. I recently rebooted after upgrading to Kernel 2.6.27.7.
When I did this I found that only 3 of my disks were in the array. When
I examine the three active elements of the array (/dev/sdd1, /dev/sde1,
/dev/sdc1) they all show that the array has 3 drives and one missing.
When I examine the missing drive it shows that all members of the array
are present, which I don't understand! When I try to add the missing
drive back is says the device is busy. Please see below and let me know
what I need to do to get this working again. Thanks Nigel:
==================================================================
[root@homepc ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[0] sdc1[3] sde1[1]
735334656 blocks level 5, 128k chunk, algorithm 2 [4/3] [UU_U]
md_d0 : inactive sdb[2](S)
245117312 blocks
unused devices: <none>
[root@homepc ~]#
==================================================================
[root@homepc ~]# cat /etc/mdadm.conf
# mdadm.conf written out by anaconda
# DEVICE partitions
MAILADDR nigel@xxxxxxxxxxxxxx
ARRAY /dev/md0 level=raid5 num-devices=4
devices=/dev/sdb1,/dev/sdc1,/dev/sdd1,/dev/sde1
[root@homepc ~]#
==================================================================
[root@homepc ~]# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Tue Apr 18 17:44:34 2006
Raid Level : raid5
Array Size : 735334656 (701.27 GiB 752.98 GB)
Used Dev Size : 245111552 (233.76 GiB 250.99 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Dec 12 17:48:12 2008
State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 128K
UUID : 50e3173e:b5d2bdb6:7db3576b:644409bb
Events : 0.6485812
Number Major Minor RaidDevice State
0 8 49 0 active sync /dev/sdd1
1 8 65 1 active sync /dev/sde1
2 0 0 2 removed
3 8 33 3 active sync /dev/sdc1
[root@homepc ~]# mdadm --examine /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 0.90.03
UUID : 50e3173e:b5d2bdb6:7db3576b:644409bb
Creation Time : Tue Apr 18 17:44:34 2006
Raid Level : raid5
Used Dev Size : 245111552 (233.76 GiB 250.99 GB)
Array Size : 735334656 (701.27 GiB 752.98 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Fri Dec 12 17:48:22 2008
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : 2ec4d801 - correct
Events : 6485814
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 8 49 0 active sync /dev/sdd1
0 0 8 49 0 active sync /dev/sdd1
1 1 8 65 1 active sync /dev/sde1
2 2 0 0 2 faulty removed
3 3 8 33 3 active sync /dev/sdc1
[root@homepc ~]# mdadm --examine /dev/sde1
/dev/sde1:
Magic : a92b4efc
Version : 0.90.03
UUID : 50e3173e:b5d2bdb6:7db3576b:644409bb
Creation Time : Tue Apr 18 17:44:34 2006
Raid Level : raid5
Used Dev Size : 245111552 (233.76 GiB 250.99 GB)
Array Size : 735334656 (701.27 GiB 752.98 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Fri Dec 12 17:48:22 2008
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : 2ec4d813 - correct
Events : 6485814
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 1 8 65 1 active sync /dev/sde1
0 0 8 49 0 active sync /dev/sdd1
1 1 8 65 1 active sync /dev/sde1
2 2 0 0 2 faulty removed
3 3 8 33 3 active sync /dev/sdc1
[root@homepc ~]# mdadm --examine /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 0.90.03
UUID : 50e3173e:b5d2bdb6:7db3576b:644409bb
Creation Time : Tue Apr 18 17:44:34 2006
Raid Level : raid5
Used Dev Size : 245111552 (233.76 GiB 250.99 GB)
Array Size : 735334656 (701.27 GiB 752.98 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Fri Dec 12 17:48:22 2008
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : 2ec4d7f7 - correct
Events : 6485814
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 3 8 33 3 active sync /dev/sdc1
0 0 8 49 0 active sync /dev/sdd1
1 1 8 65 1 active sync /dev/sde1
2 2 0 0 2 faulty removed
3 3 8 33 3 active sync /dev/sdc1
[root@homepc ~]# mdadm --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.03
UUID : 50e3173e:b5d2bdb6:7db3576b:644409bb
Creation Time : Tue Apr 18 17:44:34 2006
Raid Level : raid5
Used Dev Size : 245111552 (233.76 GiB 250.99 GB)
Array Size : 735334656 (701.27 GiB 752.98 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Fri Dec 12 17:29:15 2008
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 2ec4d1d6 - correct
Events : 6485600
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 2 8 17 2 active sync /dev/sdb1
0 0 8 49 0 active sync /dev/sdd1
1 1 8 65 1 active sync /dev/sde1
2 2 8 17 2 active sync /dev/sdb1
3 3 8 33 3 active sync /dev/sdc1
[root@homepc ~]# mdadm /dev/md0 --add /dev/sdb1
mdadm: Cannot open /dev/sdb1: Device or resource busy
[root@homepc ~]#
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