Degraded Raid6
flat view
From: Bernd Waage <hidden>
Date: 2012-12-12 20:49:07
Hello all,
I run an 8-disk raid 6 on which sporadically 2 drives dropped out, that I could just re-add when I zeroed the zuperblock beforehand. Recently, upon re-adding those 2 drives (after the zero-superblock) a third drive dropped out after 5-10 minutes of syncing. I then did a zero-superblock on the third drive and tried to re-add it - which failed.
I'm pretty much at my wits' end and stumbled upon this list. Perhaps someone of you guys can help me out. I'm running an ubuntu 12.04 box with kernel 3.3.8, so I should not be affected by the kernel-bug that popped up some time ago.
I append the output of mdadm --detail as well as mdadm --examine...
berndman@berndman:~$ sudo mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Used Dev Size : 1953509376 (1863.01 GiB 2000.39 GB)
Raid Devices : 8
Total Devices : 8
Persistence : Superblock is persistent
Update Time : Fri Nov 30 07:24:57 2012
State : active, FAILED, Not Started
Active Devices : 5
Working Devices : 8
Failed Devices : 0
Spare Devices : 3
Layout : left-symmetric
Chunk Size : 4096K
Name : berndman-System:0
UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Events : 25340
Number Major Minor RaidDevice State
0 8 81 0 active sync /dev/sdf1
9 8 49 1 active sync /dev/sdd1
2 0 0 2 removed
3 0 0 3 removed
4 8 129 4 active sync /dev/sdi1
8 8 33 5 active sync /dev/sdc1
6 8 17 6 active sync /dev/sdb1
7 0 0 7 removed
10 8 113 - spare /dev/sdh1
11 8 1 - spare /dev/sda1
12 8 65 - spare /dev/sde1
berndman@berndman:~$
* Documentation: https://help.ubuntu.com/
Last login: Wed Dec 12 21:16:35 2012 from berndman-pc.local
berndman@berndman:~$ sudo mdadm --examine /dev/sdf1 /dev/sdd1 /dev/sdi1 /dev/sdc1 /dev/sdb1 /dev/sdh1 /dev/sda1 /dev/sde1
[sudo] password for berndman:
/dev/sdf1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 4792cd00:92d53de8:4d2d7438:dc86e0fd
Update Time : Fri Nov 30 07:24:57 2012
Checksum : dc7a3261 - correct
Events : 25340
Layout : left-symmetric
Chunk Size : 4096K
Device Role : Active device 0
Array State : AA..AAA. ('A' == active, '.' == missing)
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 6670d0fb:447d937f:be88f731:f6161042
Update Time : Fri Nov 30 07:24:57 2012
Checksum : ac85a3c6 - correct
Events : 25340
Layout : left-symmetric
Chunk Size : 4096K
Device Role : Active device 1
Array State : AA..AAA. ('A' == active, '.' == missing)
/dev/sdi1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 67054bcd:7e9c5380:452a8756:14dd629e
Update Time : Fri Nov 30 07:24:57 2012
Checksum : ffa2bfa1 - correct
Events : 25340
Layout : left-symmetric
Chunk Size : 4096K
Device Role : Active device 4
Array State : AA..AAA. ('A' == active, '.' == missing)
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 8722a93e:a2397924:1d28b78b:e786004e
Update Time : Fri Nov 30 07:24:57 2012
Checksum : f9f42193 - correct
Events : 25340
Layout : left-symmetric
Chunk Size : 4096K
Device Role : Active device 5
Array State : AA..AAA. ('A' == active, '.' == missing)
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : b1426d37:1ebaa27c:f1eea681:1a55b574
Update Time : Fri Nov 30 07:24:57 2012
Checksum : 678657ff - correct
Events : 25340
Layout : left-symmetric
Chunk Size : 4096K
Device Role : Active device 6
Array State : AA..AAA. ('A' == active, '.' == missing)
/dev/sdh1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : b80ab95e:7271c8a4:87980189:25169231
Update Time : Fri Nov 30 07:24:57 2012
Checksum : 7b2ede44 - correct
Events : 0
Layout : left-symmetric
Chunk Size : 4096K
Device Role : spare
Array State : AA..AAA. ('A' == active, '.' == missing)
/dev/sda1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : a002afcf:af02cbfc:fa09bff8:252116c7
Update Time : Fri Nov 30 07:24:57 2012
Checksum : 496946da - correct
Events : 25340
Layout : left-symmetric
Chunk Size : 4096K
Device Role : spare
Array State : AA..AAA. ('A' == active, '.' == missing)
/dev/sde1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef105344:6158fb94:c37cc33b:00ac2d04
Name : berndman-System:0
Creation Time : Thu Aug 4 21:32:45 2011
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 23442112512 (11178.07 GiB 12002.36 GB)
Used Dev Size : 3907018752 (1863.01 GiB 2000.39 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : f3ff2451:d3c11122:c1e8a54a:0481d299
Update Time : Fri Nov 30 07:24:57 2012
Checksum : 14c941f6 - correct
Events : 25340
Layout : left-symmetric
Chunk Size : 4096K
Device Role : spare
Array State : AA..AAA. ('A' == active, '.' == missing)
regards,
Bernd