Hello Linux-Raid,
I have a degraded Raid 5 that I can't mount. I think it may be assembling in the wrong order. I've tryed stopping the array and reassembling but it does not work. The data presented below is taken after a system reboot. I'm at the point where I think I need use the creat command on a dregraded system(which I assume will preserve the data) but I'm hoping there may be less drastick things that can be tried first. Any suggestions??
Thanks in advance.
History:
Had an Ubuntu 8.10 system working with a Raid 5 system consisting of four HDDs and comfigured with mdadm. I lost one of the drives in the Raid. The system continued to work in degraded mode. I had not recovered or added a new drive to the Raid5 yet and lost the OS drive(which in this case is a completely different HDD). I loaded Ubuntu 12.10 on a new drive and I can not mount the degraded Raid 5 array(missing one drive).
sudo mount /dev/md0 raidmount
mount: wrong fs type, bad option, bad superblock on /dev/md0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
/proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : active raid5 sdc1[2] sdb1[3] sda1[0]
1465151808 blocks level 5, 32k chunk, algorithm 2 [4/3] [U_UU]
unused devices: <none>
mdadm -Es
ARRAY /dev/md0 UUID=d2647e99:e42e221e:9e66cfca:65ac10b8
mdadm -E /dev/sd[abc]1
/dev/sda1:
Magic : a92b4efc
Version : 0.90.00
UUID : d2647e99:e42e221e:9e66cfca:65ac10b8
Creation Time : Sun Mar 8 07:54:23 2009
Raid Level : raid5
Used Dev Size : 488383936 (465.76 GiB 500.11 GB)
Array Size : 1465151808 (1397.28 GiB 1500.32 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Thu Mar 28 07:47:57 2013
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : 1bf6a90a - correct
Events : 32498
Layout : left-symmetric
Chunk Size : 32K
Number Major Minor RaidDevice State
this 0 8 1 0 active sync /dev/sda1
0 0 8 1 0 active sync /dev/sda1
1 1 0 0 1 faulty removed
2 2 8 33 2 active sync /dev/sdc1
3 3 8 17 3 active sync /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : d2647e99:e42e221e:9e66cfca:65ac10b8
Creation Time : Sun Mar 8 07:54:23 2009
Raid Level : raid5
Used Dev Size : 488383936 (465.76 GiB 500.11 GB)
Array Size : 1465151808 (1397.28 GiB 1500.32 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Thu Mar 28 07:47:57 2013
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : 1bf6a920 - correct
Events : 32498
Layout : left-symmetric
Chunk Size : 32K
Number Major Minor RaidDevice State
this 3 8 17 3 active sync /dev/sdb1
0 0 8 1 0 active sync /dev/sda1
1 1 0 0 1 faulty removed
2 2 8 33 2 active sync /dev/sdc1
3 3 8 17 3 active sync /dev/sdb1
/dev/sdc1:
Magic : a92b4efc
Version : 0.90.00
UUID : d2647e99:e42e221e:9e66cfca:65ac10b8
Creation Time : Sun Mar 8 07:54:23 2009
Raid Level : raid5
Used Dev Size : 488383936 (465.76 GiB 500.11 GB)
Array Size : 1465151808 (1397.28 GiB 1500.32 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Thu Mar 28 07:47:57 2013
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : 1bf6a92e - correct
Events : 32498
Layout : left-symmetric
Chunk Size : 32K
Number Major Minor RaidDevice State
this 2 8 33 2 active sync /dev/sdc1
0 0 8 1 0 active sync /dev/sda1
1 1 0 0 1 faulty removed
2 2 8 33 2 active sync /dev/sdc1
3 3 8 17 3 active sync /dev/sdb1
admin0@precise64ubuntu:~$ sudo fdisk -ls
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3975b426
Device Boot Start End Blocks Id System
/dev/sda1 63 976768064 488384001 da Non-FS data
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3975b458
Device Boot Start End Blocks Id System
/dev/sdb1 63 976768064 488384001 da Non-FS data
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00098106
Device Boot Start End Blocks Id System
/dev/sdc1 63 3907024064 1953512001 83 Linux
Partition 1 does not start on physical sector boundary.
Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x0002504f
Device Boot Start End Blocks Id System
Disk /dev/sde: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005344a
Device Boot Start End Blocks Id System
/dev/sde1 * 2048 292863 145408 83 Linux
/dev/sde2 294910 1953523711 976614401 5 Extended
/dev/sde5 294912 331775 18432 82 Linux swap / Solaris
/dev/sde6 333824 19863551 9764864 83 Linux
/dev/sde7 19865600 39395327 9764864 83 Linux
/dev/sde8 39397376 41349119 975872 83 Linux
/dev/sde9 41351168 80410623 19529728 83 Linux
/dev/sde10 80412672 80449535 18432 83 Linux
/dev/sde11 80451584 99981311 9764864 83 Linux
/dev/sde12 99983360 1076543487 488280064 83 Linux
/dev/sde13 1076545536 1953523711 438489088 83 Linux
Disk /dev/sdf: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc8946d21
Device Boot Start End Blocks Id System
/dev/sdf1 63 1953520064 976760001 42 SFS
Disk /dev/md0: 1500.3 GB, 1500315451392 bytes
2 heads, 4 sectors/track, 366287952 cylinders, total 2930303616 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 32768 bytes / 98304 bytes
Alignment offset: 512 bytes
Disk identifier: 0x00000000
Disk /dev/md0 doesn't contain a valid partition table
admin0@precise64ubuntu:~$
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