Freezing VMs after power failure

[alischa]

Hello! We're switching from VMWare to the Proxmox.

We're running PVE 8.1.4. We connected the APC UPS to the PVE and configured all the necessary parameters. However, we can't find the following:

In case of the power failure, the UPS (when the battery is at 20%) will shutdown the host, which in its turn will shutdown its VMs. Is it possible to configure this so that the VMs will be frozen and not shutdown or forcefully stopped (like pulling the power cable out)?

Thanks!

 

[czechsys]

Freezing = save RAM to disk. I don't think PVE has this feature. I saw it in XEN a very long time ago, never used it after anymore.

 

[UdoB]

In the context of "HA" you can find: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#ha_manager_shutdown_policy and it includes "Freeze".

I am not really sure how it works, I've never tested it. And I am not really sure how it works without HA enabled...

 

[juddyjacob]

You can install nut on your proxmox nodes. Im not really sure on how to configure it but I know it can be super useful. I have a Nas server that uses nut to remain on for a predetermined amount of time, and if power is not restored it shuts off. I didnt write any of the scripts but it is useful. Something I intend to look into.