Raid 10 failed

gpetrom · 14. August 2012

Hi

I have a raid 10 setup and i had a problem with one of my disks. I changed the disk and tryied to recover the raid. It started to resync and after it finished i saw in openmediavault that it failed. The output of cat /proc/mdstat

Code

md0 : active raid10 sdc[4](F) sdb[0](F) sde[3] sdd[2]
      1465146368 blocks super 1.2 512K chunks 2 near-copies [4/2] [__UU]

Code

root@server:~# mdadm --detail /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Tue Mar  6 21:33:01 2012
     Raid Level : raid10
     Array Size : 1465146368 (1397.27 GiB 1500.31 GB)
  Used Dev Size : 732573184 (698.64 GiB 750.15 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent


    Update Time : Tue Aug 14 22:08:07 2012
          State : clean, FAILED
 Active Devices : 2
Working Devices : 2
 Failed Devices : 2
  Spare Devices : 0


         Layout : near=2
     Chunk Size : 512K


           Name : server:Storage  (local to host server)
           UUID : e513cc74:2296c4cd:0d1ffb05:79027b9e
         Events : 83190


    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       0        0        1      removed
       2       8       48        2      active sync   /dev/sdd
       3       8       64        3      active sync   /dev/sde


       0       8       16        -      faulty spare   /dev/sdb
       4       8       32        -      faulty spare   /dev/sdc

Alles anzeigen

I have tried with mdadm --assemble /dev/md0 nothing happens any idea what can i do?

Thanks

sandstroem · 15. August 2012

Hi,

You might try to remove the faulty spares, remove the raid info on them and try add them back:

Look what mdadm says about those spares:

Code

# mdadm --query /dev/sdb
# mdadm --query /dev/sdc

EDIT: This should be how you remove faulty spares:

Code

# mdadm /dev/md0 --remove detached

I'll leave the below instructions anyway...

Removing a faulty disk from an array:

Code

# mdadm --remove /dev/md0 /dev/sdb
# mdadm --remove /dev/md0 /dev/sdc

Clearing any previous raid info on a disk (eg. reusing a disk from another decommissioned raid array)

Code

# mdadm --zero-superblock /dev/sdb
# mdadm --zero-superblock /dev/sdc

Do it on your own risk

ppfdez · 19. August 2012

You have 2 drives in fault. In raid10, 2 drives fault, depending of the ones, can cause a fatal situation. Is the data available?

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