From mboxrd@z Thu Jan 1 00:00:00 1970 From: William Colls Subject: Raid Problem - Unknown File System Type Date: Wed, 09 Nov 2011 11:12:59 -0500 Message-ID: <4EBAA68B.6090906@rogers.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: "linux-raid@vger.kernel.org" List-Id: linux-raid.ids Environment Kubuntu Linux 10.04.3 LTS mdadm 2.6.7.1-1ubuntu15 I have two identical disks that were in a raid configuration in another machine (also running 10.04). I removed them from the old machine, mounted them in a new machine, booted up, and at a terminal prompt as root issued mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc The configuration in the old machine was raid 1. I checked the contents of /proc/mdstat and it confirmed that md0 was indeed running, with 2 devices, as expected. But it also said it was resyncing the disks, which I didn't expect. When the reync completed, I was unable to mount /dev/md0p1. Specifying -t ext3 in the mount command gives the error message "wrong fs, bad option, bad superblock on /dev/md0p1". Trying mount with no -t gives the error "unknown file type linux_raid_member". Looking at the disks with Gparted, confims that the system sees the disks, but the filesystem shows as unknown. The output from mdamd --detail /dev/sdb /dev/sdb: Magic : a92b4efc Version : 00.90.00 UUID : 1443e74d:f63f16ab:d527ef8c:7225e0b0 Creation Time : Tue Nov 8 13:14:48 2011 Raid Level : raid1 Used Dev Size : 732574464 (698.64 GiB 750.16 GB) Array Size : 732574464 (698.64 GiB 750.16 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Tue Nov 8 16:05:42 2011 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : c4195c85 - correct Events : 34 Number Major Minor RaidDevice State this 0 8 16 0 active sync /dev/sdb 0 0 8 16 0 active sync /dev/sdb 1 1 8 32 1 active sync /dev/sdc --- end of output Output from mdadm --examine /dev/sdc /dev/sdc: Magic : a92b4efc Version : 00.90.00 UUID : 1443e74d:f63f16ab:d527ef8c:7225e0b0 Creation Time : Tue Nov 8 13:14:48 2011 Raid Level : raid1 Used Dev Size : 732574464 (698.64 GiB 750.16 GB) Array Size : 732574464 (698.64 GiB 750.16 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Tue Nov 8 16:05:42 2011 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : c4195c97 - correct Events : 34 Number Major Minor RaidDevice State this 1 8 32 1 active sync /dev/sdc 0 0 8 16 0 active sync /dev/sdb 1 1 8 32 1 active sync /dev/sdc ---- end of output So - am I truly up the creek without a paddle? Is there any way to recover this array? I have backups of most of it, but it will take a while to find and restore. And for sure something will be lost. Thanks for your time. -- I know you believe that you understand what you think I said, but I am not sure that you realize that what you heard was not what I ment.