From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sam van Ratt Subject: MDADM after QNAP Support disaster QNAP 859 Pro Date: Sat, 27 Oct 2012 17:26:42 +0200 Message-ID: <508BFD32.7010901@gmx.net> Reply-To: Sam.vanRatt@gmx.net Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org, Michael Samer EPOS GmbH List-Id: linux-raid.ids Hello a few days I received a NAS with 8 Slots. The original config consistet of 8* 2TB HDs as a RAID6 mdadm softraid system. After a normal reboot the array was no longer found, so QNAP was contacted. The support told the keyuser todo this: mdadm -D /dev/md0 (zeigt das gesamte RAID auf) to assemble the HDs you have to: mdadm -A /dev/md0 /dev/sda3.... (take care here, depending on the HDs they get a value like /dev/sdb3 dev/sdc3 ...) - with 8 HDs: mdadm -A /dev/md0 /dev/sda3 /sdb3 /dev/sdc3 /dev/sdd3 /dev/sde3 /dev/sdf3 /dev/sdg3 /dev/sdh3 (be careful with the order!) If you get an error message about the assemble, you have to stop md0 mdadm -S /dev/md0 (stopping md0) umount /dev/md0 (unmount of md0) After serveral failed tries it endet in have a RAID 1 Konfig on sda and sdb but not seeing anything else of the config before (funnily only a 500MB partition (as /dev/md9 sounds as a lot of tries). As I'm not using mdadm in my workplace anywhere: How can I delete the RAID1 (pretty simple I know) and reconstruct the R6 Array without damaging the config further (and therefore the datas). The R6 should be about 11TiB usable size. Is there a init build with searching for the old conifg? As R6 it should even be readable without sda or sdb if this should be needed. I manly use HW RAID Controller where a few (ICP, Infortrend, Areca) which allows a reassembly by just declaring the disks as member to mdx and assemble then again; I hope mdadm could offer something similar Cheers Sam