zfs snapshot windows server


Well-Known Member
Sep 22, 2016

I have a windows server and when I snapshot clone it and attach disk to another windows server new and changed files are not there.

zfs sync=standard also tried sync=always

disk is "writeback" also tried "no cache" and "write through"

I also tried to snapshot server when it is offline/turned off, same thing.

When I reboot original server, all files are present and good.

Any clues?

I'm afraid I don't follow you completely. Could you provide the commands to reproduce your problem? What is the output of
qm config VMID
new and changed files are not there.
Are we talking about changed after your clone or after some snapshot in the past?

Basically I have a windows server running and when I add new files or remove folder and then take a snapshot on proxmox, clone it and run attach it to another vm running windows, the changes are not there. This is also the case if I change files, shutdown vm and then take snapshot.

I tried "no cache" and "write through" on the VM and the above is the same.

So very weird, I now upgraded to proxmox 6.x and it works as exspected with "write through" on the VM


Great that upgrading solved your problem! We'd appreciate if you could mark the thread as resolved by editing the top post. Of course, you can always open a new thread if something should go wrong.

The problem is happening because you do not have instaled/active the guest agent in the VM. Without the guest agent the snapshot can not call fsfreeze and flush the VM data cache to disk.

Good luck / Bafta !


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