Hi list,
Hope someone can give me the right direction on how to resolve this.
I have 12 hard drives with RAID software. (250 GB each disk) I just
know it was a 2 TB array. The old operating system which supported the
array is no longer online. (just in case someone asks me to check the
mdadm.conf file)
From what I can see with mdadm,is that there are 2 x RAID5 arrays of
990.72 GB each. (2 TB the whole array). So I believed that there is a
RAID0 between both RAID5 arrays. Right? (RAID50) The first RAID5 group
is composed by 5 discs, all of them active. Here is the post: (all
/dev/sdb4 /dev/sdc4 /dev/sdd4 /dev/sde4 /dev/sdf4 are similar and have
the same UUID)
# mdadm --examine /dev/sdb4
----------------------------
/dev/sdb4:
Magic : a92b4efc
Version : 00.91.00
UUID : 48b86fc7:adbd7bbe:df7c7359:36df38af
Creation Time : Tue Apr 24 18:14:28 2007
Raid Level : raid5
Used Dev Size : 241873792 (230.67 GiB 247.68 GB)
Array Size : 967495168 (922.68 GiB 990.72 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Reshape pos'n : 0
New Level : raid0
New Layout : left-asymmetric
New Chunksize : 0
Update Time : Mon Nov 29 21:01:33 1999
State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Checksum : 42da3120 - correct
Events : 0.61
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 3 4 0 active sync
0 0 3 4 0 active sync
1 1 22 4 1 active sync
2 2 33 4 2 active sync
3 3 34 4 3 active sync
4 4 56 4 4 active sync
---------------------
But If I try to assemble this 1st RAID5 array:
# mdadm --assemble /dev/md0 /dev/sdb4 /dev/sdc4 /dev/sdd4 /dev/sde4 /dev/sdf4
mdadm: Failed to restore critical section for reshape, sorry.
Is not possible. I also try the build option:
# mdadm --build /dev/md0 -l5 -n5 --assume-clean /dev/sdb4 /dev/sdc4
/dev/sdd4 /dev/sde4 /dev/sdf4
mdadm: Raid level 5 not permitted with --build.
On the other hand there is the second RAID5 group which outputs the following:
------------------
# mdadm --examine /dev/sdg4
/dev/sdg4:
Magic : a92b4efc
Version : 00.91.00
UUID : 384bd728:158c759c:e9be7911:01187b1f
Creation Time : Tue Apr 24 18:14:48 2007
Raid Level : raid5
Used Dev Size : 241873792 (230.67 GiB 247.68 GB)
Array Size : 967495168 (922.68 GiB 990.72 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 1
Reshape pos'n : 0
New Level : raid0
New Layout : left-asymmetric
New Chunksize : 0
Update Time : Mon Nov 29 21:01:36 1999
State : active
Active Devices : 4
Working Devices : 6
Failed Devices : 0
Spare Devices : 2
Checksum : 6eb7dc84 - correct
Events : 0.65
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 89 4 1 active sync
0 0 0 0 0 faulty removed
1 1 89 4 1 active sync
2 2 90 4 2 active sync
3 3 91 4 3 active sync
4 4 120 4 4 active sync
5 5 121 4 5 spare
6 6 88 4 6 spare
------------------------------------
The 2nd RAID5 group was composed by 7 disks (I believed, as shown
above). 1 disks is faulty and 2 disks are spare. But even though with
the remaining 4 disks I could try to assemble the RAID5, but I have
the same result as with the 1st RAID5. (mdadm: Failed to restore
critical section for reshape, sorry.)
Do you have any idea on how to re-assemble this RAID 50 array ?
Thanks for any advice & help.
Nicolas
PS:
# mdadm -V
mdadm - v2.6 - 21 December 2006
Linux lab-suse 2.6.16.46-0.12-smp #1 SMP Thu May 17 14:00:09 UTC 2007
x86_64 x86_64 x86_64 GNU/Linux
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