Sorry, the command should be: mdadm --assemble --force /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/hdb1 Hope that helps. Guy -----Original Message----- From: David Greaves [mailto:david@xxxxxxxxxxxx] Sent: Saturday, November 13, 2004 2:49 PM To: Guy Cc: linux-raid@xxxxxxxxxxxxxxx Subject: Re: RAID5 - 2nd drive died whilst waiting for RMA OK, not great, but nothing has broken either. So the reboot happened, the disks went in and got moved around: new drive->/dev/sdd1 the machine hung complaining 'ata4 timed out' during dd if=sda of=sdd :( reboot, did it again and it worked fine ( - no errors? maybe it was transient? anway...) powerdown move sickly drive (sda) to new controller (new:sde) move new copy (sdd) to position 1 (new:sda) insert new spare disk (new:sdd) of course, the partitions are 'fd' so boot produces: md: Autodetecting RAID arrays. md: invalid raid superblock magic on sdd1 md: sdd1 has invalid sb, not importing! # that's fair, I just made a partition, never used, no sb md: autorun ... md: considering sde1 ... # hmm, ok, it's fd and has a superblock but should be marked faulty md: adding sde1 ... md: adding sdc1 ... md: adding sdb1 ... md: adding sda1 ... md: adding hdb1 ... md: created md0 md: bind<hdb1> md: bind<sda1> md: bind<sdb1> md: bind<sdc1> md: export_rdev(sde1) # what does this mean? does it mean 'sb is marked faulty'? md: running: <sdc1><sdb1><sda1><hdb1> md: kicking non-fresh sda1 from array! # OK, so you recognise it as an md device but think it's dirty - good md: unbind<sda1> md: export_rdev(sda1) raid5: device sdc1 operational as raid disk 1 raid5: device sdb1 operational as raid disk 2 raid5: device hdb1 operational as raid disk 4 raid5: not enough operational devices for md0 (2/5 failed) # as expected Now, Guy, your next step: # mdadm --assemble --force /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/hdb1 mdadm: /dev/sda1 does not appear to be an md device Oh. So the first thing I'm doing is to cleanly redo the dd_rescue from (now) sde to sda Comments? David PS Guy, my ISP has blocked comcast.net due to excessive spam - he's reconsidered and will unblock them 'soon' but for now I can only apologise :( - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
