I'm running 10.04 LTS Desktop 64bit, with two identical disks set up as a raid 1 array. Last week I kicked the power lead from the back of the PC Using the rescue disk to repair grub, I can now boot from sda2 mounted at /, while sdb2 seems OK but not mounted.
The swap partitions, sda1 & sdb1, still appear to be part of raid mdb1.
Can someone kindly please advise me how to reassemble the boot/data part of the raid, using sda2 as the master disk and overwriting sdb2?
Everything on sda2 has been backed up. Mdadm & mdstat output follows.
Mick
mick@mick-desktop:~/Desktop$ sudo mdadm -E /dev/sd[ab]2 mdadm: No md superblock detected on /dev/sda2. mdadm: No md superblock detected on /dev/sdb2. mick@mick-desktop:~/Desktop$ sudo mdadm -E /dev/sd[ab]1 /dev/sda1: Magic : a92b4efc Version : 00.90.00 UUID : 6e5f04e7:a2c2824e:4190d0c1:868b9bfb Creation Time : Thu Jun 17 11:59:49 2010 Raid Level : raid1 Used Dev Size : 7812032 (7.45 GiB 8.00 GB) Array Size : 7812032 (7.45 GiB 8.00 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Update Time : Thu Aug 2 11:58:37 2012 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : 1f150e2e - correct Events : 7340 Number Major Minor RaidDevice State this 0 8 1 0 active sync /dev/sda1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 00.90.00 UUID : 6e5f04e7:a2c2824e:4190d0c1:868b9bfb Creation Time : Thu Jun 17 11:59:49 2010 Raid Level : raid1 Used Dev Size : 7812032 (7.45 GiB 8.00 GB) Array Size : 7812032 (7.45 GiB 8.00 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Update Time : Thu Aug 2 11:58:37 2012 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : 1f150e40 - correct Events : 7340 Number Major Minor RaidDevice State this 1 8 17 1 active sync /dev/sdb1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 mick@mick-desktop:~/Desktop$ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active raid1 sdb1[1] sda1[0] 7812032 blocks [2/2] [UU] unused devices: mick@mick-desktop:~/Desktop$
sudo sfdisk -d /dev/sd[ab]
(as code so it's formatted OK)? I suspect the rescue disk has changed /sda2 to be simply a Linux (type 83) partition rather than Raid (type FD).