From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Brown Subject: Re: Cannot re-assemble Degraded RAID6 after crash Date: Tue, 18 Dec 2007 14:09:32 +1100 Message-ID: <18279.14828.345584.52508@notabene.brown> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: message from Erich Newell on Monday December 17 Sender: linux-raid-owner@vger.kernel.org To: Erich Newell Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Monday December 17, erich.newell@gmail.com wrote: > My system has crashed a couple of times, each time the two drives have > dropped off of the RAID. > > Previously I simply did the following, which would take all night: > > mdadm -a --re-add /dev/md2 /dev/sde3 > mdadm -a --re-add /dev/md2 /dev/sdf3 > mdadm -a --re-add /dev/md3 /dev/sde5 > mdadm -a --re-add /dev/md3 /dev/sde5 > > When I woke up in the morning, everything was happy...until it crashed > again yesterday. This time, I get a message: "/dev/md3 assembled from > 4 drives - not enough to start the array while not clean - consider > --force." > > I can re-assemble /dev/md3 (sda5, sdb5, sdc5, sdd5, sde5 and sdf5) if > I use -f, although all the other sets seem fine. I cannot "--re-add" > the other partitions. What happens when you try to re-add those devices? How about just "--add". --re-add is only need for arrays without metadata, in your case it should behave the same as --add. NeilBrown