On Mon, 10 Jan 2005, Alasdair G Kergon wrote: > On Mon, Jan 10, 2005 at 08:43:24AM -0500, Mark T. Valites wrote: > > logical extent (56202) already mapped. > > Couldn't fill logical volume maps. > > Metadata corruption: eg 2 LV sharing a PE. > If you forcibly ran LVM1 and LVM2 on the same VG at the same time > that could lead to this. Upgrading to LVM2 has been on my to-do list for a while, but I finally got around to it because I was sick of seeing "Duplicate Volume ID" errors each time lilo loaded. I made backups of my MBR/partition tables on both disks and then tried to edit the bytes of the disk representing the Volume ID, which I quickly discovered were used by LVM1 for metadata and by changing the bytes that normally held the Volume ID info, I "broke" LVM. I put the original MBR/partition table back quickly and LVM was happy again. If I currently boot an LVM1 capable kernel, I can mount the VG fine and access/manipulate the data on it, so it works in LVM1 now - if the metadata was in fact corrupted, would LVM still work? I could see how my mucking around would have (and did) break things, but I put the parts of disk back and it works correctly now. > Make sure you're using a recent version of LVM2. I see 2.00.33 is the most current. I'm using the 2.00.24-1 package provided in Debian testing - is it worth compiling the latest? > You'll need to restore your metadata from a backup using vgcfgrestore - > but first you need to work out which is the correct backup to restore > from, then use either lvm1 or lvm2 vgcfgrestore depending which format > that backup is in. Does this assume I've done a vgcfgbackup previously? Or does LVM keep copies of this itself (similar to UFS and alternate superblocks?) The description of the vgcfgrestore from its manpage leads me to think I need to point it at a previously vgcfgbackup-ed file. While I have backups of the data, I don't of the vgcfg. But if my LVM 1 setup is working, I wonder if we even need to think about the above. Or is it possible to vgcfgbackup from with the working LVM1 and vgcfgrestore when booted into LVM2? And more importantly, what exaclty should I backup before making a worse situation for myself? -- Mark T. Valites Unix Systems Analyst Computing & Information Technology SUNY Geneseo >--))> >--))> _______________________________________________ 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/
