help with recover data from software raid 1

Franz Waldmüller waldbauernbub at
Sat Jul 30 23:20:44 UTC 2011


I want to recover files from a disk which has been part of a raid1 
array. I don't want to mount it degraded, as all operations must be read 

Can I mount the partiton of the disk as an ext4 filesystem (the raid was 
formatted as ext4.)?

In my server to harddisks are used in mirrored array to save all 
important data.
/dev/sdb1 and /dev/sdc1

today I created another md-device with the created partitions /dev/sdb2 
and /dev/sdc2. Unfortunately I didn't edit the /etc/mdadm/mdadm.conf 
file properly.
When I rebooted the server I checked /proc/mdstat
and saw the following resync process:

md1 : active raid1 sdc[1] sdb2[0]
       391382976 blocks [2/2] [UU]
       [>....................]  resync =  0.1% (745088/391382976)

That is wrong, as the first device is sdc, but it should be sdc2.
I halted the server and now have to recover the files from /dev/sdb1. 
/dev/sdc1 could have suffered damage from the resync process.

I hope that you can help me with your advice.


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