Backups causing VMs to shutdown

[marieelieg]

Hi everyone.

So I have a hyper-v cluster. I created a backup on a VM and made it run during the night. In the morning I found that their was a .avhdx file in the LUN of the VM and the VM was shut down. I believe that this .avhdx file was growing too big and there wasn't enough free space in the LUN and that's what caused the VM to shut down. What I want to know is what is this .avhdx file and is there a way to explicitly specify where Veeam should create it?

Really appreciate any help and thank you in advance.
Marie-Elie.

[Andreas Neufert]

It is hard to say based on the given information`s what the root cause is.

.avhdx is a SnapShot/Checkpoint file.

I highly recommend to immediately create a Veeam Support ticket (this forum is not part of Veeams Support organisation). As your production is down, you can create a severity 1 to have super fast reaction time.

[marieelieg]

Thank you, will do.

But is there a way to manually change the location of this checkpoint/snapshot?

[Andreas Neufert]

The Checkpoint folder can be edited in the VM properties. Managment - SnapShot/Checkpoint File Location.

I do not know if this has performance drawbacks.
At least for Windows 2016 you should let them stay on the same volume to use ReFS internal operations that reduce overhead of creation/deletion of that files to nearly zero.

[marieelieg]

Okay thank you very much. Will see what happens.

[Vitaliy S.]

Additionally, you can consider installing Veeam ONE Free to monitor VM snapshots and be alerted if VM snapshot is not removed after a backup job.

[marieelieg]

Okay thank you so much:D