From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: permanently removing a spare Date: Wed, 18 May 2011 05:44:14 +1000 Message-ID: <20110518054414.3df34a76@notabene.brown> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Tobias McNulty Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Tue, 17 May 2011 15:09:18 -0400 Tobias McNulty wrote: > On Wed, May 11, 2011 at 9:49 PM, Tobias McNulty 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. = =A0A > > quick mdadm --assemble brought the array back online. > > > > However, now I am trying to update mdadm.conf, and I hit what I thi= nk > > is this bug: > > > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D610184 > > > > So I thought I'd try to remove the spare from my raid5 array. =A0I > > marked it as failed and then removed it, and the spare no longer sh= ows > > in /proc/mdstat: > > > > md0 : active raid5 sda[0] sdd[3] sdc[2] sdb[1] > > =A0 =A0 =A05860543488 blocks level 5, 64k chunk, algorithm 2 [4/4] = [UUUU] > > > > However, when I do mdadm -Es, I still see it: > > > > ARRAY /dev/md0 UUID=3D25a818ff:68f07e28:0d7656f3:2f233380 > > =A0 spares=3D1 > > > > And I still see the "error: superfluous RAID member (4 found)." err= or > > when running update-grub (even if I leave out the spares=3D1 part). > > > > Is there a way to "permanently" remove the spare "slot" from the > > array? =A0I tried mdadm --grow --spare-devices=3D0, since the man p= age > > arguably suggests that --spare-devices should work in grow mode, bu= t > > running the command reports that it's not actually supported. =A0To= the > > credit of the man page, the description of --spare-devices *does* s= ay > > it is used in the *initial* array creation. > > > > Does what I'm trying to do make sense? =A0Is there a way to make th= e > > 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. >=20 > 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. >=20 > 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 s= ee how a spare would interfere with that, bugs.debian.org isn't responding jus= t now. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html