Snapshots on CEPH

[ednt]

Hi,
at the weekend we run into a problem:
We made snapshots of windows servers for backups to transport the images.
In one case the windows server immediately rebootet and did not found his boot drive anymore.
We had to completely stop the server and start it again. Then, fortunately, the server comes up again.

We started to search for a reason, but the only thing we found was:

Note
STOP I/O BEFORE snapshotting an image. If the image contains a filesystem, the filesystem must be in a consistent state BEFORE snapshotting.

at
https://docs.ceph.com/docs/giant/rbd/rbd-snapshot/

How is this handled by ProxMox?

Or can there be an other reason for the behaviour of the windows server?

 

[Alwin]

STOP I/O BEFORE snapshotting an image. If the image contains a filesystem, the filesystem must be in a consistent state BEFORE snapshotting.

This is true for all filesystems, on any snapshot capable storage.

How is this handled by ProxMox?

The guest-agent needs to be active and installed in the VM. Then the filesystem (Windows VSS) will be notified to flush.
https://pve.proxmox.com/pve-docs/chapter-qm.html#qm_options

Or can there be an other reason for the behaviour of the windows server?

Certainly. Check the Windows & host logs.