PBS RAM usage

[dgood]

I'm using an old ESXi server to run Proxmox Backup Server. It has 192GB of RAM but never uses more than about 99GB (according to the Memory usage graph on the Server Administration page). I'm assuming most of that is just caching indexes and whatnot, but it seems like it should be able to use as much as is available. Is there a setting that keeps it from using more RAM?

 

[SteveITS]

If you're using ZFS (?) there's a limit for ARC cache.

 

[dgood]

That could be — by default it uses half of system RAM. I'll see if I can bump it up.

 

[Onslow]

@dgood
https://pve.proxmox.com/wiki/ZFS_on_Linux
and search for the section "Limit ZFS Memory Usage".

 

[Impact]

This should do it so the defaults are used which should be more than just 50% nowadays

rm -f /etc/modprobe.d/zfs.conf
update-initramfs -ukall
reboot

You might have to update the bootloader too.

Also check this before and after

zarcsummary -s arc | less

You can also set it live. For example with this.

@Onslow Or you can get the link from the TOC and link to it or to the docs about it