High Memory PROXMOX Host

[OXIB]

Hi Everyone,
I am new to Proxmox and have been liking it so far.
The host I have is using a lot of memory. I don't have anything super big as most people out there, just a simple computer running an i7-4790K CPU with 32GB of RAM and 2TB of HD Space set in ZFS RAID.
I only have two windows VM running and the RAM is 75%. The VMs are not using all that RAM.
I installed Windows Server 2016 following the video here:
https://forum.proxmox.com/threads/install-windows-2016-server-on-proxmox-ve-video-tutorial.31344/
Everything went smooth without any problems.

Here is a screeshot of what the high memory looks like:


Here is what the VM's are running:


Here is what the host shows:


If you can give an idea as to what might be causing this, I'd really appreciate it.
Thanks!

 

[dietmar]

ZFS use most available memory for cache.

 

[OXIB]

Thanks for you fast response dietmar. So this is normal and there is nothing that can be done?
Would I be able to still keep adding VM's? If I do, will the RAM just keep going up?
Is it better to change ZFS to another file system?
Thanks again,

 

[dietmar]

Thanks for you fast response dietmar. So this is normal and there is nothing that can be done?

Sure, you can limit memory usage. See https://pve.proxmox.com/wiki/ZFS_on_Linux

 

[OXIB]

Thanks very much, will try and report back.

 

[killmasta93]

Lower the arc size

nano /etc/modprobe.d/zfs.conf

I would give 4gigs max because im stingy lolz

# Min 2048MB / Max 4096 MB Limit with 32 gigs of ram
options zfs zfs_arc_min=2147483648
options zfs zfs_arc_max=4294967296

save and then update

update-initramfs -u

then reboot

 

[OXIB]

Thanks killmasta93, i will update it with the new settings. I updated it with what the website recommends 8Gigs and it's running much better.
Thanks again.