mdadm question

UNIX for Advanced & Expert Users
1

Hello, I have 4 drives (500G each) in a raid 10, I got a power failior and this is the result?

 
 cat /proc/mdstat
Personalities :
md126 : inactive sdb[3] sdc[2] sdd[1] sde[0]
      1953536528 blocks super external:-md127/0
md127 : inactive sdd[3](S) sde[2](S) sdb[1](S) sdc[0](S)
      9028 blocks super external:imsm
unused devices: <none>

dmraid -ay -t
isw_dcdhceeejb_Volume0-0: 0 976768000 mirror core 2 131072 nosync 2 /dev/sdb 0 /dev/sdc 0 1 handle_errors
isw_dcdhceeejb_Volume0-1: 0 976768000 mirror core 2 131072 nosync 2 /dev/sdd 0 /dev/sde 0 1 handle_errors
isw_dcdhceeejb_Volume0: 0 1953536000 striped 2 8 /dev/mapper/isw_dcdhceeejb_Volume0-0 0 /dev/mapper/isw_dcdhceeejb_Volume0-1 0

How to get the RAID up and running again I tried:

mdadm --assemble -v /dev/md126 /dev/sdb /dev/sdc /dev/sdd /dev/sde --run

but the result was no the expected.

2

If the result wasn't what was expected, what was the result?

---------- Post updated at 11:46 AM ---------- Previous update was at 11:40 AM ----------

Ahah:

Personalities : (complete and total lack of any raid modes)

Mine looks like

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]

It doesn't look like you have any RAID modules loaded. Try modprobe raid10 and try again.

3

cat /proc/mdstat
Personalities : [raid10]
unused devices: <none>

mdadm --assemble -v /dev/md126 /dev/sdb /dev/sdc /dev/sdd /dev/sde --run
mdadm: looking for devices for /dev/md126
mdadm: /dev/sdb is identified as a member of /dev/md126, slot -1.
mdadm: /dev/sdc is identified as a member of /dev/md126, slot -1.
mdadm: /dev/sdd is identified as a member of /dev/md126, slot -1.
mdadm: /dev/sde is identified as a member of /dev/md126, slot -1.
mdadm: added /dev/sdc to /dev/md126 as -1
mdadm: added /dev/sdd to /dev/md126 as -1
mdadm: added /dev/sde to /dev/md126 as -1
mdadm: added /dev/sdb to /dev/md126 as -1
mdadm: Container /dev/md126 has been assembled with 4 drives

cat /proc/mdstat
Personalities : [raid10]
md126 : inactive sdb[3](S) sde[2](S) sdd[1](S) sdc[0](S)
9028 blocks super external:imsm

4

This should print detailed stats on the drives, and detailed info on the array:

mdadm --examine /dev/sdb
mdadm --examine /dev/sdc
mdadm --examine /dev/sdd
mdadm --examine /dev/sde
mdadm --detail /dev/md126