NaibofTabr , 10 months ago

I see this:

Supports addition and removal of devices with no rebuild times

But also this:

MergerFS has zero fault tolerance - if the drive that data is stored on fails, that data is gone.

ref

So… what happens when the USB cable gets bumped mid-write, and the drives in the external enclosure suddenly go offline? Because the cable will get bumped at some point, probably at the worst possible time.

Genuine question, I don’t have experience with MergerFS. OP’s planned setup seems fault-prone to me, rather than fault-resistant.