Re: Recovering RAID5 array

[Jean Jordaan <jean@upfrontsystems.co.za>]

> mdadm --assemble /dev/md0 --force /dev/hd[abc]3
>
> should put it back together for you.

No luck ..

cdimage root # mdadm --verbose --assemble /dev/md0 --force /dev/hda3 /dev/hdb3 
/dev/hdc3
mdadm: looking for devices for /dev/md0
mdadm: /dev/hda3 is identified as a member of /dev/md0, slot 3.
mdadm: /dev/hdb3 is identified as a member of /dev/md0, slot 4.
mdadm: /dev/hdc3 is identified as a member of /dev/md0, slot 2.
mdadm: no uptodate device for slot 0 of /dev/md0
mdadm: no uptodate device for slot 1 of /dev/md0
mdadm: added /dev/hda3 to /dev/md0 as 3
mdadm: added /dev/hdb3 to /dev/md0 as 4
mdadm: added /dev/hdc3 to /dev/md0 as 2
mdadm: /dev/md0 assembled from 1 drive - not enough to start it (use --run to 
insist).

cdimage root # cat /proc/mdstat
Personalities : [raid5]
read_ahead not set
md0 : inactive ide/host0/bus1/target0/lun0/part3[2] 
ide/host0/bus0/target1/lun0/part3[4] ide/host0/bus0/target0/lun0/part3[3]
      0 blocks
unused devices: <none>
cdimage root # mdadm --verbose --examine /dev/hda3
/dev/hda3:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : dd5156aa:9157bc3c:9500db42:445b91fe
  Creation Time : Wed Dec 17 11:44:50 2003
     Raid Level : raid5
    Device Size : 38001664 (36.24 GiB 38.91 GB)
   Raid Devices : 3
  Total Devices : 4
Preferred Minor : 0

    Update Time : Mon Jan 19 07:41:21 2004
          State : dirty, no-errors
 Active Devices : 1
Working Devices : 3
 Failed Devices : 1
  Spare Devices : 2
       Checksum : 736178ae - correct
         Events : 0.82

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     3       3        3        3        /dev/ide/host0/bus0/target0/lun0/part3
   0     0       0        0        0      faulty removed
   1     1       0        0        1      faulty removed
   2     2      22        3        2      active sync 
/dev/ide/host0/bus1/target0/lun0/part3
   3     3       3        3        3        /dev/ide/host0/bus0/target0/lun0/part3
   4     4       3       67        4        /dev/ide/host0/bus0/target1/lun0/part3

I think /dev/hdb3 was the one originally marked faulty,
and I wrongly --set-faulty /dev/hda3 ..

--
Jean Jordaan
http://www.upfrontsystems.co.za

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