https://lists.fedoraproject.org/pipermail/users/2015-February/458923.html I don't see how the VG metadata is restored with any of the commands suggested thus far. I think that's vgcfgrestore. Otherwise I'd think that LVM has no idea how to do the LE to PE mapping. In any case, this sounds like a data scraping operation to me. XFS might be a bit more tolerant because AG's are distributed across all 4 PV's in this case, and each AG keeps its own metadata. But I still don't think the filesystem will be mountable, even read only. Maybe testdisk can deal with it, and if not then debugfs -c rdump might be able to get some of the directories. But for sure the LV has to be active. And I expect modifications (resizing anything, fscking) astronomically increase the chance of total data loss. If it's XFS xfs_db itself is going to take longer to read and understand than just restoring from backup (XFS has dense capabilities). On the other hand, Btrfs can handle this situation somewhat well so long as the fs metadata is raid1, which is the mkfs default for multiple devices. It will permit degraded mounting in such a case so recovery is straightforward. Missing files are recorded in dmesg. Chris Murphy