Too much free RAM

sax

Cadet
Joined
Mar 21, 2024
Messages
1
Hello,
I have truenas scale with 64GB RAM but only about 26GB is used. Can I enforce truenas to use more RAM for ZFS Cache?
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HoneyBadger

actually does care
Administrator
Moderator
iXsystems
Joined
Feb 6, 2014
Messages
5,112
Hi @sax

On TrueNAS SCALE 23.10, you can follow these instructions to increase the ARC allotment above the default.

In the upcoming TrueNAS SCALE 24.04 (Dragonfish) this setting will be the default.

Your system dashboard also shows that you only have 48GB usable, as opposed to the 64GB you mention. Can you check your BIOS and ensure that all of the physically installed RAM is properly detected there? If it is, please run the following command from a shell (web or SSH) to ensure that all DIMMs are shown:

dmidecode -t 17 | grep Size
 
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