On Sunday June 8, maurice@harddata.com wrote: > Hi there. > > I am a bit stumped on this one, and hope somebody can suggest a way to > recover it. > The user has no backup, and hopes to recover data from this array. > > Assistance would be deeply appreciated. Based on "Events", sda1, sdc1, sdd1 are most recent. sdb1 is much older. So assuming they were in order, I would: mdadm -C /dev/md0 -l 5 -n 4 /dev/sda1 missing /dev/sdc1 /dev/sdd1 and then see what the filesystem looks like. Doing this will not corrupt any data except the superblocks (which are already close to useless), so if it doesn't look right, you can stop the array and assemble difference devices in a difference order. > > System has 4 IDE disks on a 3Ware 4 port. > RAID5. > > One of the disks apparently went offline without the user noticing. > Now the array is in a read-only state. > Probable cause is that these are WD 1800GB drives, and they have not had > the WD patch applied, so probably drives started going to "sleep". > > I provide some (hopefully) useful information: > > In mdadm --examine I see that somehow the devices 1,2,3, have now been > renamed to devices 4,5,6 > > And that 2 devices have become designated as spares. > > This really puzzles me. The simplest explanation would be that someone did: mdadm -r /dev/md0 /dev/sda1 ; mdadm -a /dev/md0 /dev/sda1 or something like that. Good luck, NeilBrown - 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
