Hello guys,
I have been using md raids for quite a long time now and it always
worked fine, until recently when I upgraded some hardware on my
workstation. Unfortunately the hardware I changed proved itself to be
very unstable, and I encountered a lot of hard lockups of the system
while running. Those lockups recently made one of my raid 1 array
fails with the infamous error message "mdXX: bitmap superblock UUID
mismatch".
Here is what I have found in the kernel logs when I try to activate
the given raid group:
-----------------
md/raid1:md126: active with 2 out of 2 mirrors
md126: bitmap superblock UUID mismatch
md126: bitmap file superblock:
magic: 6d746962
version: 4
uuid: 37102258.af9c1930.b8397fb8.eba356af
events: 199168
events cleared: 199166
state: 00000000
chunksize: 524288 B
daemon sleep: 5s
sync size: 248075584 KB
max write behind: 0
md126: failed to create bitmap (-22)
-----------------
Such error messages are displayed each time I try to run the raid
group. Content of /proc/mdstat is:
-----------------
md126 : inactive sdb6[0] sda6[1]
496151168 blocks
-----------------
If I try to examine both disks with mdadm -E it shows some checksum
mismatch for both partitions:
-----------------
root@bob # mdadm -E /dev/sda6
/dev/sda6:
Magic : a92b4efc
Version : 0.90.03
UUID : 37102258:bf9c1930:b8397fb8:eba356af
Creation Time : Mon Aug 7 21:06:47 2006
Raid Level : raid1
Used Dev Size : 248075584 (236.58 GiB 254.03 GB)
Array Size : 248075584 (236.58 GiB 254.03 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 6
Update Time : Wed Jan 12 00:12:44 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : e4883f8e - expected e4883e8e
Events : 199168
Number Major Minor RaidDevice State
this 1 8 38 1 active sync
0 0 8 70 0 active sync
1 1 8 38 1 active sync
root@bob # mdadm -E /dev/sdb6
/dev/sdb6:
Magic : a92b4efc
Version : 0.90.03
UUID : 37102258:bf9c1930:b8397fb8:eba356af
Creation Time : Mon Aug 7 21:06:47 2006
Raid Level : raid1
Used Dev Size : 248075584 (236.58 GiB 254.03 GB)
Array Size : 248075584 (236.58 GiB 254.03 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 6
Update Time : Wed Jan 12 00:12:44 2011
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : e4883fac - expected e4883eac
Events : 199168
Number Major Minor RaidDevice State
this 0 8 70 0 active sync
0 0 8 70 0 active sync
1 1 8 38 1 active sync
-----------------
Any idea how I could try to save my raid group?
Thanks in advance for your help.
Best Regards,
Reynald
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
