Long ago, Nostradamus foresaw that on 03/25/2013 10:04 AM, Björn Nadrowski would write: > After replacing a disc in my raid10 system (ubuntu 12.04), my volume group (that contained all my data and my system) was gone. > > Problem description is here: > > http://ubuntuforums.org/showthread.php?t=2128504 > > I managed to retrieve the metadata of the volume group and the logical volumes underneath, but I did not succeed using > > vgcfgrestore > > successfully in order to regain access to my data. > > It seems I might have to try dmsetup, but I am afraid I might destroy my data if I use it. I have no experience with that program. > No immediate help, but I would have been more paranoid under knoppix, and checked for the volume group (vgscan) *before* failing the bad disk, and *before* adding the replacement. Running pvs at those points would be advisable also. I just installed a customer system with raid10, so I am *very* interested in what went wrong. I have only used raid1 to this point, and have been *very* impressed with the improved performance of 4 disks with raid10 vs. 2 with raid1. Here is a theory to toss out: raid10 on 3 disks can tolerate only 1 disk failure. Maybe there were 2? Maybe replaced the wrong drive? Does pvs show the raid10 drive as a PV? There is no point trying to use vgcfgrestore until you have some PVs to restore it to. Where did you find the metadata? From a backup? From the beginning of the raid10 drive? _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
