Today it failed to mount on boot once again. I pressed "S" to skip
mounting, and upon trying to mount it manually, I get:
trinitr...@saturn:~$ sudo mount /media/terabyte
mount: /dev/md0: can't read superblock
trinitr...@saturn:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md_d0 : inactive sda1[0](S)
732571904 blocks
md0 : inactive sdb1[1](S) sdc1[2](S) sdd1[3](S)
2197715712 blocks
unused devices: <none>
.....Ok... so now it's putting one of my drives on md_d0 again??? Why?
Apparently ubuntu is bringing up the drives in the WRONG ORDER! All
drives [a-d] are now 1 letter incremented in the alphabet. (ie: ubuntu
thinks sdb1 should be called sda1, sdc1 should be called sdb1, etc...)
I'm not sure which drive it thinks is sde now, because it says there's
no superblock on it.
How can I fix it's mistake?
Debug info below:
-----------------------------------------------------------
trinitr...@saturn:~$ sudo mdadm --detail /dev/md0
mdadm: md device /dev/md0 does not appear to be active.
trinitr...@saturn:~$ sudo mdadm --detail /dev/md_d0
mdadm: md device /dev/md_d0 does not appear to be active.
trinitr...@saturn:~$ sudo mdadm --examine /dev/sda1
/dev/sda1:
Magic : a92b4efc
Version : 00.90.00
UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn)
Creation Time : Fri Jan 9 03:40:39 2009
Raid Level : raid5
Used Dev Size : 732571904 (698.64 GiB 750.15 GB)
Array Size : 2197715712 (2095.91 GiB 2250.46 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Thu Jul 1 00:34:29 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : b3c7801c - correct
Events : 148755
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 17 0 active sync /dev/sdb1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 65 3 active sync /dev/sde1
trinitr...@saturn:~$ sudo mdadm --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 00.90.00
UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn)
Creation Time : Fri Jan 9 03:40:39 2009
Raid Level : raid5
Used Dev Size : 732571904 (698.64 GiB 750.15 GB)
Array Size : 2197715712 (2095.91 GiB 2250.46 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Thu Jul 1 00:34:29 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : b3c7802e - correct
Events : 148755
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 33 1 active sync /dev/sdc1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 65 3 active sync /dev/sde1
trinitr...@saturn:~$ sudo mdadm --examine /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 00.90.00
UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn)
Creation Time : Fri Jan 9 03:40:39 2009
Raid Level : raid5
Used Dev Size : 732571904 (698.64 GiB 750.15 GB)
Array Size : 2197715712 (2095.91 GiB 2250.46 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Thu Jul 1 00:34:29 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : b3c78040 - correct
Events : 148755
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 49 2 active sync /dev/sdd1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 65 3 active sync /dev/sde1
trinitr...@saturn:~$ sudo mdadm --examine /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 00.90.00
UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn)
Creation Time : Fri Jan 9 03:40:39 2009
Raid Level : raid5
Used Dev Size : 732571904 (698.64 GiB 750.15 GB)
Array Size : 2197715712 (2095.91 GiB 2250.46 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Thu Jul 1 00:34:29 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : b3c78052 - correct
Events : 148755
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 65 3 active sync /dev/sde1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 65 3 active sync /dev/sde1
trinitr...@saturn:~$ sudo mdadm --examine /dev/sde1
mdadm: No md superblock detected on /dev/sde1.
--
Mdadm array fails to assemble on boot.
https://bugs.launchpad.net/bugs/573477
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