Long background story short, I have a 4P (H8QGi-F) motherboard with Ubuntu Server 16.04 mounted in a tower. It's a beast and I'm using it for computational chemistry at the moment, but will use it for more down the road. What I'm envisioning, is mounting a Pi into one of the ten HD racks and accessing the server terminal through the Pi's. That's the basic approach.
Powering the Pi, so long as the power supply is plugged in may be odd, considering I don't yet know if the mobo has continuous power at a USB. Further, I've never tried to boot a PC through a straightaway Ethernet cable, or shell into one in the same manner- I've always gone through my router, whether home network or remote SSH. The mobo doesn't have wireless, nor do I intend on attaching a wifi dongle, really. I'm more than ready to allow the Pi to remain powered permanently, using it to turn on and off the server as needed.
I feel like I'm leaving out details, but so be it for now. I'm sure this has been asked before, but I really can't find it- my googling is lacking due to sleep dep resulting from school. I'd appreciate some input from someone who knows what they're talking about.
Edit: my question is, can I run the Pi while the PC is off, use the wifi connection from the Pi to both turn off/on the PC and use the PC's terminal, and is it therefor possible to do thing like assign a temp/humidity sensor to shut down the PC in times of high humidity or temp? Sorry for the lack of concision!