[SOLVED] Incorrect RAM usage after migration

[ilbarone87]

Hello all,
a couple of days ago I set up a new node for my existing Proxmox and created a cluster. Second node use ZFS storage, 12 cored, 16Gb of RAM. I tested a vanilla Ubuntu Server before without reporting any anomalies, then yesterday migrated one of my VM from node one (ext4, lvm-thin) to the second node. The VM runs a kubernetes node of my kube cluster.
After I migrated I suddenly noticed the increased usage of RAM on node 2 even if only one VM with 8Gb of RAM was running. When I stop the VM still about 8Gb of ram seems to be allocated on the second node.
Can someone please help me to understand this and if there's a solution?

Thanks,

 

[Neobin]

It is most likely the ZFS ARC. (It can per default use up to 50% of your RAM.)
Have a look here: [1] how to check and my following post there with links how to limit its max. size.

[1] https://forum.proxmox.com/threads/ram-usage-in-proxmox.114463/#post-494833

 

[ilbarone87]

It is most likely the ZFS ARC. (It can per default use up to 50% of your RAM.)
Have a look here: [1] how to check and my following post there with links how to limit its max. size.

[1] https://forum.proxmox.com/threads/ram-usage-in-proxmox.114463/#post-494833

I see. Thank you for this.