On 20/10/15 03:35, andras@xxxxxxxxxxxxxxxx wrote: > From here on, things went downhill pretty damn fast. I was not able to > unmount the file-system, stop or re-start the array (/proc/mdstat went > away), any process trying to touch /dev/md1 hung, so eventually, I run > out of options and hit the reset button on the machine. > > Upon reboot, the array wouldn't assemble, it was complaining that SDA > and SDA1 had the same superblock info on it. > > mdadm: WARNING /dev/sda and /dev/sda1 appear to have very similar > superblocks. > If they are really different, please --zero the superblock on one > If they are the same or overlap, please remove one from the > DEVICE list in mdadm.conf. > > At this point, I looked at the drives and it appeared that the drive > letters got re-arranged by the kernel. My three new HDD-s (which used to > be SDH, SDI, SDJ) now appear as SDA, SDB and SDD. > > I've read up on this a little and everyone seemed to suggest that you > repair this super-block corruption by zeroing out the suport-block, so I > did: > > mdadm --zero-superblock /dev/sda1 OUCH !!! REALLY REALLY REALLY don't do anything now until the experts chime in !!! It looks to me like you have a 0.9 superblock, and this error message is both common and erroneous. There's only one superblock, but it looks to mdadm like it's both a disk superblock and a partition superblock. You've just wiped those drives, I think ... The experts should be able to recover it for you (I hope), but your array is now damaged - don't damage it any further !!! Cheers, Wol -- 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
