Environment
Kubuntu Linux 10.04.3 LTS
mdadm 2.6.7.1-1ubuntu15
I have two identical disks that were in a raid configuration in another
machine (also running 10.04). I removed them from the old machine,
mounted them in a new machine, booted up, and at a terminal prompt as
root issued
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
The configuration in the old machine was raid 1.
I checked the contents of /proc/mdstat and it confirmed that md0 was
indeed running, with 2 devices, as expected. But it also said it was
resyncing the disks, which I didn't expect.
When the reync completed, I was unable to mount /dev/md0p1. Specifying
-t ext3 in the mount command gives the error message "wrong fs, bad
option, bad superblock on /dev/md0p1". Trying mount with no -t gives the
error "unknown file type linux_raid_member". Looking at the disks with
Gparted, confims that the system sees the disks, but the filesystem
shows as unknown.
The output from mdamd --detail /dev/sdb
/dev/sdb:
Magic : a92b4efc
Version : 00.90.00
UUID : 1443e74d:f63f16ab:d527ef8c:7225e0b0
Creation Time : Tue Nov 8 13:14:48 2011
Raid Level : raid1
Used Dev Size : 732574464 (698.64 GiB 750.16 GB)
Array Size : 732574464 (698.64 GiB 750.16 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Tue Nov 8 16:05:42 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : c4195c85 - correct
Events : 34
Number Major Minor RaidDevice State
this 0 8 16 0 active sync /dev/sdb
0 0 8 16 0 active sync /dev/sdb
1 1 8 32 1 active sync /dev/sdc
--- end of output
Output from mdadm --examine /dev/sdc
/dev/sdc:
Magic : a92b4efc
Version : 00.90.00
UUID : 1443e74d:f63f16ab:d527ef8c:7225e0b0
Creation Time : Tue Nov 8 13:14:48 2011
Raid Level : raid1
Used Dev Size : 732574464 (698.64 GiB 750.16 GB)
Array Size : 732574464 (698.64 GiB 750.16 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Tue Nov 8 16:05:42 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : c4195c97 - correct
Events : 34
Number Major Minor RaidDevice State
this 1 8 32 1 active sync /dev/sdc
0 0 8 16 0 active sync /dev/sdb
1 1 8 32 1 active sync /dev/sdc
---- end of output
So - am I truly up the creek without a paddle? Is there any way to
recover this array? I have backups of most of it, but it will take a
while to find and restore. And for sure something will be lost.
Thanks for your time.
--
I know you believe that you understand what you think I said, but I am
not sure that you realize that what you heard was not what I ment.
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