Hello, I have found a solution to the problem, however the problem seems to come back after every reboot. I have been put on the good path by the remarks made on this list by John and Gionatan. The fix is the following: - convince myself that the device has the correct uuid, I used blkid and compared the result with the information in the lvm backup - run pvck -t on /dev/sdc. Nothing special, all seems OK - run vgscan --cache. This command brings back knowledge of the VG the PV belongs to - now pvs lists my PV again, but the LV is inactive - I activate the LV with lvchange - all is back, I can mount and use the LV After a reboot however the information about the VG is gone again, and I have to repeat the steps above to be able to use the LV. I have a running system, but I don't know what is happening. Where can I look to figure this out? Regards, Giuseppe -- Giuseppe Vacanti