Re: lots of "md: export_rdev(sde)" printed after create IMSM RAID10 with missing

[Yi Zhang <yizhan@redhat.com>]

On 09/12/2016 06:58 PM, Artur Paszkiewicz wrote:
> On 09/12/2016 10:03 AM, Yi Zhang wrote:
>> Hello Artur
>> With your patch, no "md: export_rdev(sde)" printed after create raid10.
>>
>> I found another problem, not sure whether it is reasonable, could you help confirm it, thanks.
>> When I create one container with 4 disks[1], and create one raid10 with 3 disks(sd[b-d]) + 1 missing [2], but it finally bind the fourth disk: sde [3].
>>
>> [1] mdadm -CR /dev/md0 /dev/sd[b-e] -n4 -e imsm
>> [2] mdadm -CR /dev/md/Volume0 -l10 -n4 /dev/sd[b-d] missing --size=500M
>> [3] # cat /proc/mdstat
>> Personalities : [raid10]
>> md127 : active raid10 sde[4] sdd[2] sdc[1] sdb[0]
>>        1024000 blocks super external:/md0/0 128K chunks 2 near-copies [4/4] [UUUU]
>>
>> md0 : inactive sde[3](S) sdd[2](S) sdc[1](S) sdb[0](S)
>>        4420 blocks super external:imsm
>>
>> unused devices: <none>
> I think that this is correct behavior. Because there is a spare disk
> available in the container, it is used for rebuilding the volume. This
> is equivalent to:
>
> mdadm -CR /dev/md0 /dev/sd[b-d] -n3 -e imsm
> mdadm -CR /dev/md/Volume0 -l10 -n4 /dev/sd[b-d] missing --size=500M
> mdadm -a /dev/md0 /dev/sde
got, thanks Artur for the confirmation.

Yi
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