Incorrect node memory usage

[popey]

On the first pve node I have 384GB with 9 VMs. Total RAM assigned for those machines is 153GB but in node summary I can see RAM usage 70.03 (264.54 GiB of 377.77 GiB)
all of the VMs (Windows) have virtio/balloon/qemu-agent installed.

So why there is so high consumption?

 

[fluxX04]

Hi,

what root filesystem are you using?

Greetz

 

[popey]

Hi,

what root filesystem are you using?

Greetz

I use ZFS

 

[fluxX04]

Hi,

ZFS can use 50% of your host memory for cache. If you need you can limit the ARC:
https://pve.proxmox.com/pve-docs/pve-admin-guide.html#sysadmin_zfs_limit_memory_usage

Greetz

 

[Dunuin]

I use ZFS

ZFSs ARC will use up to 50% of your total memory by default.

 

[popey]

ZFSs ARC will use up to 50% of your total memory by default.

I use ZFS only for PVE OS, VMs data are located on external fc array

 

[Dunuin]

I use ZFS only for PVE OS, VMs data are located on external fc array

Then you should limit your ARC size. Otherwise ZFS will use up to 192 GB RAM for caching.