TrueNAS shutting down

[SGr33n]

Hi people!
I have a proxmox with a running TrueNAS instance and a Windows 11 machine that i run sometimes.
When I run Windows, sometimes TrueNAS shuts down, maybe I have not enough memory (16GB).
Is there a way to prevent this?
Thanks!

 

[Neobin]

Assign less memory to the guests and/or, in case you are using ZFS on the PVE-host, limit its ARC:
https://pve.proxmox.com/wiki/ZFS_on_Linux#sysadmin_zfs_limit_memory_usage

You could/should check the syslog, if it is the OOM-killer at all...

 

[Dunuin]

I would buy more RAM anyway. Minimum hardware requirements are:
Win11: 4GB
PVE: 2GB
TrueNAS: 8GB

So running everything at bare minimum you are already at 14 of 16GB and I personally try to be below 80% (so 12.8GB) host RAM utilization as otherwise ballooning and KSM will kick in slowing down your whole system...and some free space to not OOM is also nice to have...especially without a swap.

And I personally would at least use 8GB for Win11 and 16GB for TrueNAS for some usable performance. So 32GB would be good to have just for those two VMs. If you ant more guests even more...

 

[SGr33n]

Thanks! I hoped there was an option to limit the amount of RAM in favor of a specific machine.

 

[Dunuin]

Thanks! I hoped there was an option to limit the amount of RAM in favor of a specific machine.

There is ballooning but it doesn't work like people think it does. It will just steal the RAM, no matter if the VMs needs the RAM or not, so with it the PVE host won't kill entire VMs but instead the guestOS inside the VM might kill processes.
If you don't won't something to be killed, do not overprovision your RAM.
This usually means buying more RAM or allocating less RAM to guests.

 

[SGr33n]

There is ballooning but it doesn't work like people think it does. It will just steal the RAM, no matter if the VMs needs the RAM or not, so with it the PVE host won't kill entire VMs but instead the guestOS inside the VM might kill processes.
If you don't won't something to be killed, do not overprovision your RAM.
This usually means buying more RAM or allocating less RAM to guests.

Ok, thanks! I'm definetly adding more RAM, but should I enable or not the balooning? Thanks!