Hallo Lars, On Friday 28 March 2008 10:20:02 Lars Täuber wrote: > Hallo! > > Lars Täuber <taeuber@xxxxxxx> schrieb: > > I zeroed out all physical devices completely: > > # for DEV in /dev/sd[c-r]; do dd if=/dev/zero of=$DEV; done why not simply "mdadm --zero-superblock $DEV"? > > > > Now the problem is gone. I don't know what really caused the problem. > > Many thanks for your suggestions. > > The problem has occured again. > I'm not sure what the cause was, but the duplicated superblock is there > again. But the raid fell apart before. So I suspect this occurs only after > the array was degraded. The discs are not defective so I tried to > reassemble the array with the original discs again: monosan:~ # mdadm -A > /dev/md4 > mdadm: WARNING /dev/dm-9 and /dev/dm-8 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. > > How can I extract the superblocks to check if they are really identically? mdadm --examine /dev/dm-9 mdadm --examine /dev/dm-8 Do you have some kind of multipathing, which really could cause a identical superblocks on dm-9 and dm-8? Did you specify dm-9 and dm-8 in you mdadm.conf / assemble script or the real human readable lvm / multipath names? Cheers, Bernd -- Bernd Schubert Q-Leap Networks GmbH -- 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
