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ufmale 05-23-2008 01:05 AM
Raid 5, mdadm failure report
 
I set up a raid5 with 8 disks on a Redhat using ext3 fs. It appears my 4 disks have failed. The 8 data stack on an external tower.

cat /proc/mdadm
Code:
Personalities : [raid5]
md0 : active raid5 sdh1[8](F) sdg1[9](F) sdf1[10](F) sde1[11](F) sdd1[3] sdc1[2] sdb1[1] sda1[0]
      3418687552 blocks level 5, 64k chunk, algorithm 2 [8/4] [UUUU____]
Does it mean i have lost all the data?

The way mdadm reports the problem is very confusing. the second line of the output show sdh1 first and continue down to sda1.
However, the failure disk show [UUUU____] which seem to be sdd1-sda1 have failed. I always have trouble guessing which drive on the tower is sda or sdb and so on. Does anyone have a trick to find out which drive is sdh1 so that i can pull out the correct disks?

rtspitz 05-24-2008 12:57 PM
what you can do is this:

- determine serial number of disk and write it down (maybe on disk itself)
- use ' lshal ' to list disks in your system and associated serials.


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