[linux-lvm] Unable to mount LVM partition - table too small
Adam Newham
adam at thenewhams.com
Thu Sep 23 17:43:01 UTC 2010
Here is the info requested - it looks like on this particular boot,
/dev/sda was mapped for the OS drive and the RAID got mapped to
/dev/sd[bcde] - therefore I've dump info for /dev/sd[bcde]. So at least
for this boot sequence it looks like the RAID array doesn't align with
the device assignment.
In previous emails/logs, the RAID was /dev/sd[abcd] with the OS drive
mapped top /dev/sde. To confirm this I redid the fdisk -l & cat
/proc/partitions, /proc/mdstat
You are correct, the original array was /dev/sd[abcd] (or now
/dev/sd[bcde], with the OS drive on /dev/hda. It looks like Ubuntu maps
IDE drives to sd[x]. The 4x1TB drives are SATA, the OS drive is IDE. A
single PV/LV/VG LVM sits on top the the 3TB RAID5 with ext3 on top of
that should yield 2.7TB of usable data.
I did some Googling and came across this:
http://kevin.deldycke.com/2007/03/how-to-recover-a-raid-array-after-having-zero-ized-superblocks/
The missing superblock error is displayed when dumping /dev/sda which
makes sense as this isn't part of the RAID.
In the link above, the author recreated the RAID....however I haven't
wanted to do this (or anything else that might get categorized as
stupid) without guidance or a dd copy in case I toasted the data.
I also don't remember ever seeing /dev/md0p1 before, just a /dev/md0
root at adam-desktop:~# mdadm --examine --scan --verbose
ARRAY /dev/md0 level=raid5 num-devices=4
UUID=b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
devices=/dev/sde,/dev/sdd,/dev/sdc,/dev/sdb
ARRAY /dev/md0 level=raid5 num-devices=4
UUID=08558923:881d9efd:464c249d:988d2ec6
devices=/dev/sde1,/dev/sdd1,/dev/sdc1,/dev/sdb1
root at adam-desktop:~# mdadm --examine --verbose /dev/sdb
/dev/sdb:
Magic : a92b4efc
Version : 00.90.03
UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
Creation Time : Sat Nov 1 22:14:18 2008
Raid Level : raid5
Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Mon Sep 20 19:24:26 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : e9cec762 - correct
Events : 68
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 0 0 active sync /dev/sda
0 0 8 0 0 active sync /dev/sda
1 1 8 16 1 active sync /dev/sdb
2 2 8 32 2 active sync /dev/sdc
3 3 8 48 3 active sync /dev/sdd
root at adam-desktop:~# mdadm --examine --verbose /dev/sdc
/dev/sdc:
Magic : a92b4efc
Version : 00.90.03
UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
Creation Time : Sat Nov 1 22:14:18 2008
Raid Level : raid5
Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Mon Sep 20 19:24:26 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : e9cec774 - correct
Events : 68
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 16 1 active sync /dev/sdb
0 0 8 0 0 active sync /dev/sda
1 1 8 16 1 active sync /dev/sdb
2 2 8 32 2 active sync /dev/sdc
3 3 8 48 3 active sync /dev/sdd
root at adam-desktop:~# mdadm --examine --verbose /dev/sdd
/dev/sdd:
Magic : a92b4efc
Version : 00.90.03
UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
Creation Time : Sat Nov 1 22:14:18 2008
Raid Level : raid5
Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Mon Sep 20 19:24:26 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : e9cec786 - correct
Events : 68
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 32 2 active sync /dev/sdc
0 0 8 0 0 active sync /dev/sda
1 1 8 16 1 active sync /dev/sdb
2 2 8 32 2 active sync /dev/sdc
3 3 8 48 3 active sync /dev/sdd
root at adam-desktop:~# mdadm --examine --verbose /dev/sde
/dev/sde:
Magic : a92b4efc
Version : 00.90.03
UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
Creation Time : Sat Nov 1 22:14:18 2008
Raid Level : raid5
Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Mon Sep 20 19:24:26 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : e9cec798 - correct
Events : 68
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 48 3 active sync /dev/sdd
0 0 8 0 0 active sync /dev/sda
1 1 8 16 1 active sync /dev/sdb
2 2 8 32 2 active sync /dev/sdc
3 3 8 48 3 active sync /dev/sdd
root at adam-desktop:~# fdisk -l
Disk /dev/sda: 60.0 GB, 60011642880 bytes
255 heads, 63 sectors/track, 7296 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005cd42
Device Boot Start End Blocks Id System
/dev/sda1 * 1 6993 56165376 83 Linux
/dev/sda2 6993 7296 2437121 5 Extended
/dev/sda5 6993 7296 2437120 82 Linux swap / Solaris
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 1 121601 976760001 fd Linux raid
autodetect
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdc1 1 121601 976760001 fd Linux raid
autodetect
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdd1 1 121601 976760001 fd Linux raid
autodetect
Disk /dev/sde: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sde1 1 121601 976760001 fd Linux raid
autodetect
Disk /dev/md0: 3000.6 GB, 3000614387712 bytes
255 heads, 63 sectors/track, 364803 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 196608 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/md0p1 1 121601 976760001 fd Linux raid
autodetect
Partition 1 does not start on physical sector boundary.
root at adam-desktop:~# cat /proc/partitions
major minor #blocks name
8 0 58605120 sda
8 1 56165376 sda1
8 2 1 sda2
8 5 2437120 sda5
8 16 976762584 sdb
8 17 976760001 sdb1
8 32 976762584 sdc
8 33 976760001 sdc1
8 48 976762584 sdd
8 49 976760001 sdd1
8 64 976762584 sde
8 65 976760001 sde1
9 0 2930287488 md0
259 0 976760001 md0p1
root at adam-desktop:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : active raid5 sde[3] sdb[0] sdc[1] sdd[2]
2930287488 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
unused devices: <none>
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