Thanks for the answer. I am sorry I will not be able to point you to the exact problem that caused the disruption of the volume group. I did not make any checks before I started disassembling and reassembling the array. I did recreate the physical volume and the volume group using pvcreate and vgcreate, please see the description of the problem on ubuntuforums for further details. I now have a volume group vol0, but still no logical volumes, and vgcfgrestore still does not work. If you have any hints as to what to do now, I would be most delighted. On Mar 25, 2013, at 20:00 , Stuart D Gathman <stuart@bmsi.com> wrote: > 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/ _______________________________________________ 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/
