On Tue, 17 May 2011 15:09:18 -0400 Tobias McNulty <tobias@xxxxxxxxxxxxxxx> wrote: > 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? > If you want to stop a spare from looking like part of the array, simply mdadm --zero-superblock /dev/DEVICENAME But you really want it to assemble automatically at boot and I cannot see how a spare would interfere with that, bugs.debian.org isn't responding just now. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
