Hi all
Looking for some advice please.
My raid array failed today. I'm a total raid noob, so I'm really not
sure what the right thing to do is, and am worried I'll unnecessarily
lose data.
I had to boot using a Live CD in order to get this information, so not
sure if some valuable information is missing.
Here are results from running some commands listed on the
RAID_recovery page of the raid wiki
$ dmesg | grep raid
[ 185.301031] raid6: int64x1 1675 MB/s
[ 185.318020] raid6: int64x2 2171 MB/s
[ 185.335017] raid6: int64x4 1511 MB/s
[ 185.352039] raid6: int64x8 1425 MB/s
[ 185.369003] raid6: sse2x1 3851 MB/s
[ 185.386012] raid6: sse2x2 4746 MB/s
[ 185.403004] raid6: sse2x4 6378 MB/s
[ 185.403006] raid6: using algorithm sse2x4 (6378 MB/s)
[ 185.681200] md: raid6 personality registered for level 6
[ 185.681203] md: raid5 personality registered for level 5
[ 185.681205] md: raid4 personality registered for level 4
[ 185.681519] md/raid:md127: device sdb1 operational as raid disk 2
[ 185.681521] md/raid:md127: device sdc1 operational as raid disk 0
[ 185.682031] md/raid:md127: allocated 4312kB
[ 185.682077] md/raid:md127: not enough operational devices (2/4 failed)
[ 185.682386] md/raid:md127: failed to run raid set.
$ mdadm --examine /dev/sd[a-z]1
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 4dc53f9d:f0c55279:a9cb9592:a59607c9
Name : NAS:0
Creation Time : Sat Sep 10 12:37:59 2011
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3907027053 (1863.02 GiB 2000.40 GB)
Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : e8369dbc:bf591efa:f0ccc359:9d164ec8
Update Time : Tue May 27 04:54:37 2014
Checksum : a17a88c0 - correct
Events : 1026050
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : A.A. ('A' == active, '.' == missing)
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 4dc53f9d:f0c55279:a9cb9592:a59607c9
Name : NAS:0
Creation Time : Sat Sep 10 12:37:59 2011
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3907027053 (1863.02 GiB 2000.40 GB)
Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 78221e11:02acc1c8:c4eb01bf:f0852cbe
Update Time : Tue May 27 04:54:37 2014
Checksum : 1fbb54b8 - correct
Events : 1026050
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : A.A. ('A' == active, '.' == missing)
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 4dc53f9d:f0c55279:a9cb9592:a59607c9
Name : NAS:0
Creation Time : Sat Sep 10 12:37:59 2011
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3907027053 (1863.02 GiB 2000.40 GB)
Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : fd282483:d2647838:f6b9897e:c216616c
Update Time : Mon Oct 7 04:21:22 2013
Checksum : 6df566b8 - correct
Events : 32621
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAA ('A' == active, '.' == missing)
/dev/sde1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 4dc53f9d:f0c55279:a9cb9592:a59607c9
Name : NAS:0
Creation Time : Sat Sep 10 12:37:59 2011
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3907027053 (1863.02 GiB 2000.40 GB)
Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : e84657dd:0882a7c8:5918b191:2fc3da02
Update Time : Tue May 27 04:46:12 2014
Checksum : 33ab6fe - correct
Events : 1026039
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAA. ('A' == active, '.' == missing)
$ mdadm --examine /dev/sd[a-z]1 | egrep 'Event|/dev/sd'
/dev/sdb1:
Events : 1026050
/dev/sdc1:
Events : 1026050
/dev/sdd1:
Events : 32621
/dev/sde1:
Events : 1026039
Any and all advice greatly appreciated.
TIA
Steve
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