2014-02-24 22:54 GMT+01:00 NeilBrown <neilb@xxxxxxx>:
> On Mon, 24 Feb 2014 11:51:00 +0100 Caspar Smit <c.smit@xxxxxxxxxx> wrote:
>
>> Hi all,
>>
>> I'm having trouble removing a failed drive from an array.
>>
>> #cat /proc/mdstat
>>
>> md5 : active raid6 sdn[14](S) sdm[13](S) sdad[12] sdl[11] sdba[10]
>> sde[0](F) sdd[9] sdc[8] sdk[7] sdj[6] sdi[5] sdh[3] sdg[2]
>> 15628103680 blocks super 1.2 level 6, 512k chunk, algorithm 2
>> [10/10] [UUUUUUUUUU]
>>
>> The drive in question is sde
>>
>> #mdadm --remove /dev/md5 /dev/sde
>> mdadm: cannot find /dev/sde: No such file or directory
>>
>> The drive crashed so hard it is not visible to the kernel anymore.
>>
>> # cat /proc/partitions |grep sde
>> <no output>
>>
>> Normally in such case i do:
>>
>> #mdadm --remove /dev/md5 detached
>> <no output>
>>
>> The drive remains in the array.
>
> Odd. This suggests that /dev/sde has been removed (presumably by udev) but
> that if you create a device with the appropriate major/minor numbers, the
> device can be opened. Maybe udev got confused....
>
>>
>> Is there any other way to remove this detached drive from the array
>> without having to stop/start the array or is this a (known) bug?
>
Hi Neil,
Thanks for your answer(s)
> Try
> mdadm /dev/md5 --remove faulty
>
> that will remove all devices marked as 'faulty'.
# mdadm /dev/md5 --remove faulty
<no output>
> You could all use
>
> mdadm -If sde
# mdadm -If sde
mdadm: set sde faulty in md5
mdadm: hot removed sde from md5
#cat /proc/mdstat
md5 : active raid6 sdn[14](S) sdm[13](S) sdad[12] sdl[11] sdba[10]
sdd[9] sdc[8] sdk[7] sdj[6] sdi[5] sdh[3] sdg[2]
15628103680 blocks super 1.2 level 6, 512k chunk, algorithm 2
[10/10] [UUUUUUUUUU]
Finally that did the trick, it's gone! Thank you very much!
Kind regards,
Caspar
>
> NeilBrown
>
>
>>
>> # mdadm -V
>> mdadm - v3.1.4 - 31st August 2010
>>
>> # uname -a
>> Linux supernas01 3.2.0-0.bpo.4-amd64 #1 SMP Debian 3.2.39-2~bpo60+1
>> x86_64 GNU/Linux
>>
>> Kind regards,
>> Caspar Smit
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