On Tue, Oct 19, 2021 at 05:06:37AM -0500, Roger Heflin wrote: > I would edit the vgconfig you dd'ed with an editor and make sure it looks > reasonable for what you think you had. It turns out, comparing the information that I pulled off of the drive with what I find in /etc/lvm/backup, that the first part of the vgconfig information is missing. As I said in one of my messages, the information that I retrieved from the disk starts at 0x1200. I don't know whether that is correct or not. It does not appear to be a proper "backup" file, which I think it should be. I rebooted ( partially ) the machine and copied the vgconfig backup file from that, but am somewhat concerned, because I don't seem to be able to match the UUIDs. The one that I seem to see in the vgconfig data that I pulled off of the drive vs what I got out of /etc/lvm/backup. Maybe I am just mis-reading it. I will continue my research for a bit. > When you do the pvcreate --uuid it won't use anything except the uuid info > so the rest may not need to be exactly right, if you have to do a > vgcfgrestore to get it to read the rest of the info will be used. Oh, thank you. I did see that things got somewhat different on the target drive when I did "pvcreate --uuid --restorefile." I got paranoid when I saw that, and re-copied the ddrestore file back to the target drive before I did anything else. Should I do "pvcreate --uuid --norestorefile," instead? Then, once it is back in the machine, do the pvscan and vgcfgrestore, and expect good things? > I have seen some weird disk controller failures that appeared to zero out > the first bit of the disk (enough to get the partition table, grub, and the > pv header depending on where the first partition starts). I APPEAR to have a partition table, containing an NTFS partition, an LVM partiton ( the one that I am concentrating on ) and a Linux partion. I would have thought that it was all LVM, but my memory could easily be wrong. > You will need to reinstall grub if this was the bootable disk, since there > were 384 bytes of grub in the sector with the partition table that you know > are missing. Fortunately, this is all data, nothing to do with the boot sequence, except that the machine will not boot with the missing PV. Thank you, Brian _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
