Neil Brown wrote: > On Thursday November 29, dragos@xxxxxxxxxxx wrote: >> 2. Do you know of any way to recover from this mistake? Or at least what >> filesystem it was formated with. It may not have been lost - yet. > If you created the same array with the same devices and layout etc, > the data will still be there, untouched. > Try to assemble the array and use "fsck" on it. To be safe I'd use fsck -n (check the man page as this is odd for reiserfs) > When you create a RAID5 array, all that is changed is the metadata (at > the end of the device) and one drive is changed to be the xor of all > the others. In other words, one of your 3 drives has just been erased. Unless you know the *exact* command you used and have the dmesg output to hand then we won't know which one. Now what you need to do is to try all the permutations of creating a degraded array using 2 of the drives and specify the 3rd as 'missing': So something like: mdadm --create /dev/md0 --raid-devices=3 --level=5 missing /dev/sdb1 /dev/sdc1 mdadm --create /dev/md0 --raid-devices=3 --level=5 /dev/sdb1 missing /dev/sdc1 mdadm --create /dev/md0 --raid-devices=3 --level=5 /dev/sdb1 /dev/sdc1 missing mdadm --create /dev/md0 --raid-devices=3 --level=5 missing /dev/sdb1 /dev/sdd1 mdadm --create /dev/md0 --raid-devices=3 --level=5 /dev/sdb1 missing /dev/sdd1 mdadm --create /dev/md0 --raid-devices=3 --level=5 /dev/sdb1 /dev/sdd1 missing etc etc It is important to create the array using a 'missing' device so the xor data isn't written. There is a program here: http://linux-raid.osdl.org/index.php/Permute_array.pl that may help... David - 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
