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ZFS seems pretty RAM hungry and I don’t believe you can add new drives to an existing volume.
This is a common misunderstanding.
Short version; ZFS isn't RAM hungry, it's RAM aware. If your system has unused memory lying around, ZFS will use it to improve read performance. But it will give up that memory the moment anything else needs it.
No longer true
Oh hell yeah, I didn't know about the raidz extension. That's amazing!
It's in the latest TrueNAS versions. https://www.truenas.com/blog/electric-eel-openzfs-23/
Does TruNAS support this feature?
Related, will TruNAS work on a mini PC with an attached DAS?
It's part of ZFS 2.3.0, so it just depends what version TrueNAS is shipping with.
How is the DAS connected?
Don’t own one yet. But I guess USB?
Don't use USB to connect hdds to a nas, it isn't reliable enough and will causes problems, it's just a matter of time.
So no mini PC then? I'd have to build a tower I suppose.
TrueNAS doesn't support external connectors like USB
It does take time to free ram. If you need the ram for other things it is best practice to limit the arc cache
Only when you have to write out to swap. In the case of something like ZFS, it stores data in RAM, looks for it there, then looks on the disk. So freeing up the RAM is effectively instantaneous; you just mark the space as free, then the other process writes into it.