You will need a lvm backup file for the pvcreate --uuid I believe (there may be some option to get around needing the backup file).
That will put the header back on if you either have an lvm backup and/or archive file, you might also need a vgcfgrestore afterwards depending on if anything else is missing. I have never done it, but it looks possible to make a lvm backup file by reading it directly off the disk with dd, so that you will have a file that pvcreate is ok with, that is if there is no way to force it without a backup file. But, this should get the pv back showing up with whatever sectors that you successfully recovered. On Sun, Oct 17, 2021 at 10:02 PM Brian McCullough <b...@bdmcc-us.com> wrote: > > Folks, > > I have had a disk go bad on me, causing me to lose one PV. > > > I seem to have retrieved the partition using ddrescue, but it also seems > to be missing some label information, because pvscan doesn't see it. > > Using hexdump, I see the string " LVM2 " at 0x1004, but nothing before > that. The whole phrase is: > > 0x01000 16 d6 8e db 20 4c 56 4d 32 20 78 5b 35 41 25 72 > > > I find what appears to be an LVM2 configuration section at 0x1200, and > so I was able to read the UUID that this PV should have. > > > On another machine, I dumped a PV partition, and find "LABLEONE" at > 0x200, with the same " LVM2 " at 0x01000. > > I was concerned that my dump was offset, but the comparison to the > "good" one suggests that that isn't the problem, but just the missing > "LABLEONE" and related information at 0x0200. > > If I do a "pvcreate --uuid xxxx" would this fix that recovered partition > so that pvscan and friends can work properly, and I can finally boot > that machine? > > > Thank you, > Brian > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://listman.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://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
