Failed, but "md: cannot remove active disk..."

["Michał Sawicz" <michal@sawicz.net>]

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Hey,

I've a weird issue with a RAID6 setup, /proc/mdstat says:

> md126 : active raid6 sda1[3] sdh1[6] sdg1[0](F) sdf1[5] sdi1[1] sdc[8] sdb[7]
>       9767559680 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/6] [_UUUUUU]

So sdg1 is (F)ailed, yet `mdadm --remove` yields:

> md: cannot remove active disk sdg1 from md126 ...

in dmesg...

`mdadm --examine` shows:

> /dev/sdg1:
>           Magic : a92b4efc
>         Version : 1.2
>     Feature Map : 0x0
>      Array UUID : ff9e032c:446ed0bd:fc9473f3:f8e090ed
>            Name : media:store  (local to host media)
>   Creation Time : Tue Sep 13 21:36:43 2011
>      Raid Level : raid6
>    Raid Devices : 7
> 
> Avail Dev Size : 3907024896 (1863.01 GiB 2000.40 GB)
>      Array Size : 19535119360 (9315.07 GiB 10001.98 GB)
>   Used Dev Size : 3907023872 (1863.01 GiB 2000.40 GB)
>     Data Offset : 2048 sectors
>    Super Offset : 8 sectors
>           State : clean
>     Device UUID : 4bcee8e2:709419b6:fbeb3a8e:5c9bb68a
> 
>     Update Time : Sat May 12 21:57:27 2012
>        Checksum : ffb03189 - correct
>          Events : 304564
> 
>          Layout : left-symmetric
>      Chunk Size : 512K
> 
>    Device Role : Active device 0
>    Array State : AAAAAAA ('A' == active, '.' == missing)

So that superblock thinks it's active, but that's normal, right? It
wasn't updated due to fail? Others correctly show:

> dev/sdc:
>           Magic : a92b4efc
>         Version : 1.2
>     Feature Map : 0x0
>      Array UUID : ff9e032c:446ed0bd:fc9473f3:f8e090ed
>            Name : media:store  (local to host media)
>   Creation Time : Tue Sep 13 21:36:43 2011
>      Raid Level : raid6
>    Raid Devices : 7
> 
>  Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
>      Array Size : 19535119360 (9315.07 GiB 10001.98 GB)
>   Used Dev Size : 3907023872 (1863.01 GiB 2000.40 GB)
>     Data Offset : 2048 sectors
>    Super Offset : 8 sectors
>           State : clean
>     Device UUID : b713fd2b:eef145b0:ce91de0a:9077554b
> 
>     Update Time : Sat May 12 21:57:57 2012
>        Checksum : 80345876 - correct
>          Events : 304581
> 
>          Layout : left-symmetric
>      Chunk Size : 512K
> 
>    Device Role : Active device 2
>    Array State : .AAAAAA ('A' == active, '.' == missing)

Any ideas?

Cheers,
-- 
Michał Sawicz <michal@sawicz.net>

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