From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rudy Zijlstra Subject: Re: Raid5 fails to assemble automatically Date: Sun, 19 Jul 2015 17:09:55 +0200 Message-ID: <55ABBDC3.2070305@grumpydevil.homelinux.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Marc Desharnais , linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi Marc, On 19-07-15 16:26, Marc Desharnais wrote: > Hi, > > I'm new to this mailing list but I subscribed because of this problem > with my raid5. > I really don't want to mess this up and it was clearly suggested to > not rush things on the wiki. So I'm looking for help :) > My raid has been running great for a long time now but I think it > needs so serious maintenance. > I have a 4 disks raid 5 on ArchLinux, mdadm version 3.3.1. > > First, the raid status : > > /dev/sda: > > 1 1 0 0 1 faulty removed > > /dev/sdb: > > 1 1 0 0 1 faulty removed > 3 3 0 0 3 faulty removed > /dev/sdd: > > Number Major Minor RaidDevice State > this 1 8 16 1 active sync /dev/sdb > > 0 0 8 32 0 active sync /dev/sdc > 1 1 8 16 1 active sync /dev/sdb > 2 2 8 48 2 active sync /dev/sdd > 3 3 8 64 3 active sync /dev/sde > /dev/sde: > > > Number Major Minor RaidDevice State > this 0 8 64 0 active sync /dev/sde > > 0 0 8 64 0 active sync /dev/sde > 1 1 0 0 1 faulty removed > 2 2 8 16 2 active sync /dev/sdb > 3 3 0 0 3 faulty removed > > > > Obvisously the event count is wrong on 2 disks. One disk has been gone > for a long time now... > > 1 - First question : how can I safely assemble the raid to the latest > sync state? I don't want to mess this up. > 2 - Does this mean my hard drives are dead, or simply desync? > > > Also I tried to force assemble : > mdadm --assemble --force /dev/md0 /dev/sda /dev/sdb /dev/sde > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html First: - what information is in dmesg or kern.log, or whererever your distro stores disk messages? Asking only for the relevant parts about the disks :) - Do you have any idea when the disks were kicked out? - can you give the output of smartctl -a for each disk? - output of cat /proc/mdstat? The assemble you tried is probably failing because the raid is assembled but not started. Doing a "mdadm -S /dev/md0" should take care of that. Cheers Rudy