Re: permanently removing a spare

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On Wed, May 11, 2011 at 9:49 PM, Tobias McNulty <tobias@xxxxxxxxxxxxxxx> wrote:
>
> Hi all,
>
> After successfully converting my raid6 array to raid5, I of course
> neglected to update mdadm.conf, so the array was absent on reboot.  A
> quick mdadm --assemble brought the array back online.
>
> However, now I am trying to update mdadm.conf, and I hit what I think
> is this bug:
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610184
>
> So I thought I'd try to remove the spare from my raid5 array.  I
> marked it as failed and then removed it, and the spare no longer shows
> in /proc/mdstat:
>
> md0 : active raid5 sda[0] sdd[3] sdc[2] sdb[1]
>      5860543488 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
>
> However, when I do mdadm -Es, I still see it:
>
> ARRAY /dev/md0 UUID=25a818ff:68f07e28:0d7656f3:2f233380
>   spares=1
>
> And I still see the "error: superfluous RAID member (4 found)." error
> when running update-grub (even if I leave out the spares=1 part).
>
> Is there a way to "permanently" remove the spare "slot" from the
> array?  I tried mdadm --grow --spare-devices=0, since the man page
> arguably suggests that --spare-devices should work in grow mode, but
> running the command reports that it's not actually supported.  To the
> credit of the man page, the description of --spare-devices *does* say
> it is used in the *initial* array creation.
>
> Does what I'm trying to do make sense?  Is there a way to make the
> array forget that it ever had a spare in the first place?
>
> I'm a little afraid to reboot until I get this figured out.

Hey all - I think I am missing something obvious but I am not sure
what it is, and I still haven't turned up anything in my own
searching.

Do you have any advice for what I need to do so that the array is
mounted automatically on boot again?

Thank you!
Tobias
--
Tobias McNulty, Managing Member
Caktus Consulting Group, LLC
http://www.caktusgroup.com
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