I picked up the 5-in-3 Sata cage this morning at the suppliers, along with a 40pin to 44pin IDE adapter. The adapter is for a data recovery attempt on a laptop drive.
I’m going to test a few things with the sata cage tonight, hopefully. Preliminary tests last night hot-pluging a sata drive on a linux box at home on a promise controller didn’t look to promising though. Nothing showed up in the system logs, nothing seemed to recognize the new drive until a reboot. So even if the linux driver for the promise tx4 I have doesn’t support hot plug, having the cage will make swapping drives when they die much faster than the current process of pulling the 4U out of the rack, half-way disassembling it all, replacing the drive, and putting everything back.
It looks pretty too!