How To Get the Most From Your TrueNAS Scale: Arc Memory Cache Tuning [YouTube Release]

Additional Resources:

ZFS Arc Value Location
/sys/module/zfs/parameters/zfs_arc_max

Bytes converter

TrueNAS Scale Half Used Memory Issue
https://ixsystems.atlassian.net/browse/NAS-112185

Deeper dive into Linux Memory Management
https://blogs.oracle.com/linux/post/linux-slub-allocator-internals-and-debugging-1

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:stopwatch:Time Stamps :stopwatch:
00:00 :arrow_forward: TrueNAS Scale Setting ZFS Arc Cache Memory
02:00 :arrow_forward: TrueNAS Scale Memory Usage
02:48 :arrow_forward: How To Set zfs_arc_max

#truenas #storage #zfs

I had previously followed this guide and my ZFS Cache was going good. I just installed 24.04.1.1 and now my ZFS Cache is only 1.6GB, leaving 120GB free. It used to be 62GB and I had a zfs_arc_max set to 100GB … is anyone else seeing this issue

If you are in the latest version you shouldn’t have to set the arc size anymore. It is done automatically like the CORE version.

Soooo, this is going to get better? Like I said, previously it was using 50% by default.

It grows as it’s used and does not use it all after a reboot.

1 Like