Hi,
I've got myself into a pickle:
$ sudo mdadm -As
mdadm: /dev/md6 assembled from 2 drives and 2 spares - not enough to
start the array.
This was a 5 device raid6 array, made up of /dev/sd[abcdh]1. I'm
unsure what caused /dev/sdh to need resync, during this process
/dev/sdb decided it was a good time to get hardware problems, and this
slowed the resync down to <1000kB/s.
Then I got the incredible idea that I didn't need the drive that was
_actually_ failing, and failed/pulled the disk labeled with that
particular serial number, only to find out I had labeled it wrong,
which left me with:
$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md6 : inactive sdc1[0](S) sdd1[6](S) sdh1[5](S) sda1[3](S)
3906236416 blocks
unused devices: <none>
As far as I've gone through google and this list, I should first try
mdadm --assemble --force and if that fails try to re-create the array.
Force assemble fails, so I guess re-create it is. I've looked at
Permute array.pl and just have the following questions
do I need to re-create it to the same /dev/mdN device?
with raid6 should I try permutations with two missing drives or go for
one missing and --assume-clean?
is there any point to ddrescue / clone /dev/sdb when it has a
different event count than the rest?
there is no --read-only involved in creating the array, only mounting?
Hope you guys can help me out with some input here!
regards,
Bjorn
/dev/sda1:
Magic : a92b4efc
Version : 00.90.00
UUID : 50ed6314:84f965cd:c5795ac2:70ba0679
Creation Time : Thu May 29 20:51:39 2008
Raid Level : raid6
Used Dev Size : 976559104 (931.32 GiB 1000.00 GB)
Array Size : 2929677312 (2793.96 GiB 2999.99 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 6
Update Time : Sun Dec 19 12:12:34 2010
State : clean
Active Devices : 2
Working Devices : 4
Failed Devices : 3
Spare Devices : 2
Checksum : 84f2dc10 - correct
Events : 1290388
Chunk Size : 256K
Number Major Minor RaidDevice State
this 3 8 1 3 active sync /dev/sda1
0 0 8 33 0 active sync /dev/sdc1
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 8 1 3 active sync /dev/sda1
4 4 0 0 4 faulty removed
5 5 8 113 5 spare /dev/sdh1
6 6 8 49 6 spare /dev/sdd1
-----------------------------------------------------------------
/dev/sdb1:
Magic : a92b4efc
Version : 00.90.00
UUID : 50ed6314:84f965cd:c5795ac2:70ba0679
Creation Time : Thu May 29 20:51:39 2008
Raid Level : raid6
Used Dev Size : 976559104 (931.32 GiB 1000.00 GB)
Array Size : 2929677312 (2793.96 GiB 2999.99 GB)
Raid Devices : 5
Total Devices : 4
Preferred Minor : 6
Update Time : Sun Dec 19 12:02:52 2010
State : active
Active Devices : 3
Working Devices : 4
Failed Devices : 2
Spare Devices : 1
Checksum : 84df28e2 - correct
Events : 1290382
Chunk Size : 256K
Number Major Minor RaidDevice State
this 1 8 17 1 active sync /dev/sdb1
0 0 8 33 0 active sync /dev/sdc1
1 1 8 17 1 active sync /dev/sdb1
2 2 0 0 2 faulty removed
3 3 8 1 3 active sync /dev/sda1
4 4 0 0 4 faulty removed
5 5 8 113 5 spare /dev/sdh1
-----------------------------------------------------------------
/dev/sdc1:
Magic : a92b4efc
Version : 00.90.00
UUID : 50ed6314:84f965cd:c5795ac2:70ba0679
Creation Time : Thu May 29 20:51:39 2008
Raid Level : raid6
Used Dev Size : 976559104 (931.32 GiB 1000.00 GB)
Array Size : 2929677312 (2793.96 GiB 2999.99 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 6
Update Time : Sun Dec 19 12:12:34 2010
State : clean
Active Devices : 2
Working Devices : 4
Failed Devices : 3
Spare Devices : 2
Checksum : 84f2dc2a - correct
Events : 1290388
Chunk Size : 256K
Number Major Minor RaidDevice State
this 0 8 33 0 active sync /dev/sdc1
0 0 8 33 0 active sync /dev/sdc1
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 8 1 3 active sync /dev/sda1
4 4 0 0 4 faulty removed
5 5 8 113 5 spare /dev/sdh1
6 6 8 49 6 spare /dev/sdd1
-----------------------------------------------------------------
/dev/sdd1:
Magic : a92b4efc
Version : 00.90.00
UUID : 50ed6314:84f965cd:c5795ac2:70ba0679
Creation Time : Thu May 29 20:51:39 2008
Raid Level : raid6
Used Dev Size : 976559104 (931.32 GiB 1000.00 GB)
Array Size : 2929677312 (2793.96 GiB 2999.99 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 6
Update Time : Sun Dec 19 12:12:34 2010
State : clean
Active Devices : 2
Working Devices : 4
Failed Devices : 3
Spare Devices : 2
Checksum : 84f2dc40 - correct
Events : 1290388
Chunk Size : 256K
Number Major Minor RaidDevice State
this 6 8 49 6 spare /dev/sdd1
0 0 8 33 0 active sync /dev/sdc1
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 8 1 3 active sync /dev/sda1
4 4 0 0 4 faulty removed
5 5 8 113 5 spare /dev/sdh1
6 6 8 49 6 spare /dev/sdd1
-----------------------------------------------------------------
/dev/sdh1:
Magic : a92b4efc
Version : 00.90.00
UUID : 50ed6314:84f965cd:c5795ac2:70ba0679
Creation Time : Thu May 29 20:51:39 2008
Raid Level : raid6
Used Dev Size : 976559104 (931.32 GiB 1000.00 GB)
Array Size : 2929677312 (2793.96 GiB 2999.99 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 6
Update Time : Sun Dec 19 12:12:34 2010
State : clean
Active Devices : 2
Working Devices : 4
Failed Devices : 3
Spare Devices : 2
Checksum : 84f2dc7e - correct
Events : 1290388
Chunk Size : 256K
Number Major Minor RaidDevice State
this 5 8 113 5 spare /dev/sdh1
0 0 8 33 0 active sync /dev/sdc1
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 8 1 3 active sync /dev/sda1
4 4 0 0 4 faulty removed
5 5 8 113 5 spare /dev/sdh1
6 6 8 49 6 spare /dev/sdd1
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