I'm trying to add some storage to my homebuilt NAS (debian, ZFS-on-linux, all drive bays full, can't do rack equipment at this time) and thought a USB-C 3.1/3.2 enclosure might fit the bill, as this is for low-priority data that I'd like to keep nearline (ie. shows I've already finished). Doesn't have to be fast, just reliable.
Well, I've already tried solutions from Orico, Yottamaster, and Mediasonic, and they all have problems that make them unusable: One (Orico) didn't have enough power to actually drive a completely populated enclosure (5-bay model only has 70-watt PSU). Another would spin the drives down after 30 minutes of uptime, even after a firmware update to disable that behavior. Yet another had data issues on the backplane (thank goodness for ZFS or I might not have noticed it).
Does anyone have any good experience with USB-attached enclosures that don't completely suck and have been shown to work fine with ZFS?
If not: What is a cheap, reliable way to add more drives to a NAS that is full?