Problem with time within vms

[undefine]

I have a Proxmox cluster with several Debian 12 virtual machines. These VMs use ntpd to synchronize time with local NTP servers. Under normal conditions, everything works correctly. However, when creating a disk-only snapshot, I observe that the VM’s internal time freezes for approximately 0.3–0.8 seconds. Shortly afterward, ntpd performs a time "step" to correct the offset, but I would prefer to avoid this issue entirely.

The problem occurs on VMs using both local-lvm and ceph storage. All VMs have the qemu-guest-agent installed, and no freeze-related messages appear during snapshot creation.

 

[fiona]

Hi,
even when creating a disk-only snapshot, the VM needs to be paused, so that the state of the disks in the snapshots is from the same time.

Do you have the guest agent enabled in the configuration? It is recommended to freeze the file systems, otherwise it cannot be guaranteed that the raw disk state (which the storage snapshot represents) is consistent from a filesystem perspective.

Do you have any actual issue with the time? If the offset is corrected right away, that sounds to me like it works as intended.