Hi



I just has a weird issue on a Proxmox 5 cluster. It's been running well with a Synology NAS on NFS in sync mode for a while now. Last week, we had a VM that no longer started after reboot, it said no boot device. When I attached a livecd, fdisk did not see partitions any more. We had the issue on 2 VM's total since.



I managed to restore one of them by recovering the partition table and reinstalling grub. The scary thing is that we had 4 snapshot backups going back a week that all had the same issue.



qemu-img showed the qcow2 files to be consistent.



Any idea what could have caused this? I'm suspecting the snapshot backups themselves as the cause...



EDIT: The affected VM's where running CentOS 7 and Debian 9.