LinuxQuestions.org - md: kicking non-fresh sda6 from array!

Hi!

Today I ran in the same problem, but it presented a bit different.
My /proc/mdstat looked like this:

Code:

# cat /proc/mdstat

Personalities : [raid6] [raid5] [raid4] 

md0 : inactive sdc[4] sdd1[3] sdb[5]

      5860538097 blocks super 1.2

      

unused devices: <none>

And i was unable to remove/fail the device specified in the "non-fresh" line.

So I had to manually assemble the raid with:

mdadm --assemble /dev/md0 /dev/sdb /dev/sdc /dev/sdd1 /dev/sde --force

I tried it without --force a few times but it didn't work.
With --force it assembled the array and my /proc/mdstat looked like this:

Code:

 more /proc/mdstat

Personalities : [raid6] [raid5] [raid4] 

md0 : active (auto-read-only) raid6 sdc[4] sdd1[3] sdb[5]

      3907020800 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/3] [_UUU]

      

unused devices: <none>

Also mdadm --detail /dev/md0 showed, that /dev/sde was already removed (?).

Code:

mdadm --detail /dev/md0

/dev/md0:

        Version : 1.2

  Creation Time : Fri Jun 24 19:29:50 2011

    Raid Level : raid6

    Array Size : 3907020800 (3726.03 GiB 4000.79 GB)

  Used Dev Size : 1953510400 (1863.01 GiB 2000.39 GB)

  Raid Devices : 4

  Total Devices : 3

    Persistence : Superblock is persistent



    Update Time : Mon Feb 24 03:27:03 2014

          State : clean, degraded

 Active Devices : 3

Working Devices : 3

 Failed Devices : 0

  Spare Devices : 0



        Layout : left-symmetric

    Chunk Size : 512K



          Name : sarah:0  (local to host sarah)

          UUID : 1a148a7f:4d6a55ca:86bdec2e:c2b06689

        Events : 229601



    Number  Major  Minor  RaidDevice State

      0      0        0        0      removed

      4      8      32        1      active sync  /dev/sdc

      5      8      16        2      active sync  /dev/sdb

      3      8      49        3      active sync  /dev/sdd1

Then I was able to add /dev/sde again and now it's rebuilding.

Code:

# more /proc/mdstat

Personalities : [raid6] [raid5] [raid4] 

md0 : active raid6 sde[6] sdc[4] sdd1[3] sdb[5]

      3907020800 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/3] [_UUU]

      [>....................]  recovery =  0.7% (14500864/1953510400) finish=1815.8min speed=17796K/sec

      

unused devices: <none>