If power efficiency is important, then you will want to look for CPUs with low TDP.
I reccomend this video by Wolfgang
Or this one by hardware haven
They go into depth on low power home servers.
this post was submitted on 24 Nov 2023
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Thanks for sharing the videos. Super helpful
TLDR:is a 4 Bay chassis provide sufficient protection for freenas ZFS with total ~ 10TB usable storage? or do I need 8 Bay?
There is no requirement of a particular number of disks for ZFS. You can run ZFS on a single disk.
But for TRUENAS (FreeNAS name has been dead for years now), you will dedicate one entire disk to the OS, so keep it small (just shove a small SSD in the case somewhere), and then decide how many disks you need to buy to accommodate the amount of storage you need. Then decide if you ever want to expand that capacity. THAT should determine what kind of case you buy.
Is a dell R320 or R510 sensible in terms of power efficiency for freenas?
Dear God, no.
Dear God, no.
any suggestions for second hand chassis?
Any desktop computer that has enough SATA ports and space in the case for your desired configuration, that is from this last decade, should work fine.
Dell rackmount servers are power hungry and loud.