"J. David Beutel" <jdb@xxxxxxxxx> writes:
> Neil Brown wrote:
>> 2.6.12 does support reducing the number of drives in a raid1, but it
>> will only remove drives from the end of the list. e.g. if the
>> state was
>>
>> 58604992 blocks [3/2] [UU_]
>>
>> then it would work. But as it is
>>
>> 58604992 blocks [3/2] [_UU]
>>
>> it won't. You could fail the last drive (hdc8) and then add it back
>> in again. This would move it to the first slot, but it would cause a
>> full resync which is a bit of a waste.
>>
>
> Thanks for your help! That's the route I took. It worked ([2/2]
> [UU]). The only hiccup was that when I rebooted, hdd2 was back in the
> first slot by itself ([3/1] [U__]). I guess there was some contention
> in discovery. But all I had to do was physically remove hdd and the
> remaining two were back to [2/2] [UU].
mdadm --zero-superblock /dev/hdd
Never forget that when removing a disk. It sucks when you reboot and
your / is suddenly on the removed disk instead of the remaining raid.
MfG
Goswin
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