this post was submitted on 08 Apr 2024
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Oh no.
Unfortunately I have a lot of experience with this: attaching permanent array members via USB is a bad idea. OP, if it's not too late, and assuming you haven't already and decided to double down on yolo, I'd recommend reading about the downsides of this approach. It is easy to find relevant discussions (and catastrophes) in r/zfs.
Thunderbolt enclosures are a bit more expensive, but they won't periodically fuck up your shit just because.
Been on USB enclosures using Linux software raid for 20 years and never lost a bit so far.
Didn't go cheap with USB jbod, and i have no idea if zfs is more sensitive to USB... But I don't use zfs either so don't know.
But again I have been using two jbods over USB:
All three raid are managed by Linux software raid stack.
The original one I think I started in the 2000's, then upgraded disks many times and slowly moving to ssds to lower heat production and power usage.
Keep them COOL that's important.
I've been on the USB train since 2019.
You're exactly right, you gotta get devices with good USB-to-SATA chipsets, and you gotta keep them cool.
I've been using a mix of WD Elements, WD MyBook and StarTech/Vantec enclosures (ASM1351). I've had to cool all the chipsets on WD because they like bolt the PCBs straight to the drive so it heats up from it.
From all my testing I've discovered that:
I like this box in particular because it uses a very straightforward design. It's got 4x ASM235CM with cooling connected to a VIA hub. It's got a built-in power supply, fan, it even comes with good cables. It fixes a lot of the system variables to known good values. You're left with connecting it to a good USB host controller.
WD PCB on disk