How to limit ZFS memory/ARC cache size

[garywastaken]

Hello,

My system has 48GB of memory but half of it is used by the ZFS Cache. I need to run more VMs but in their menu its says that only 5 GiB is available for me to use.

How can I limit my ZFS cache size to free up some memory?

Thank you.

 

[m.dolensek]

Hey, I'm not really an expert here since I'm just starting to dwell into the TrueNAS world. But from what I've came across is that the ZFS cache is using 50% of available RAM by default but in case that the system need more it is then allocated back to the system.

I have came across this post when researching something that may be relevant to you;
SCALE using only 50% of RAM for ZFS by default?
and this;
TrueNAS SCALE VM + ZFS cache memory usage

Hope it helps

 

[NugentS]

Correct. ARC (ZFS Cache) will be reduced as required