okay so, update.
I tried to get a working solution together with what I have by essentially rerouting the SAS cables from the backplane of the R710 i have to this SAS card in the R430 running my unraid server.
The R710 is stuck in "no bootable media found" which is intended; but I assume the drives are still getting power (though their LED indicators on the front face are inoperable because the SAS cables are no longer plugged into the factory SAS card).
However, I cannot get the new SAS controller to show up in the R430's inventory despite it currently running, getting power, and the corresponding LEDs being lit.
Normally, to get additional drives to show up on unraid via this server, you have to go into the Device Configuration pre-boot and set all the drives to Non-RAID. However, I only see the factory PERC controller the R430 came with (along with the 8 drives I already have setup), and not the new SAS card. I cannot get it to recognize a hardware change despite giving power to the card. Normally, when a hardware change is detected, it will force boot into the Lifecycle Controller.
I've attached pictures. The card is inserted in the first x8 slot; please excuse the janky setup, it is an ad hoc solution until my riser comes in this weekend.
This was my attempt at getting this to work. I thought "this SHOULD work, as all I need the 710 to do is provide power and it can sit there and be stuck in "no media found" while the 430 reads the drives."
If anyone's got some expertise on why the 430 won't read the card, I appreciate it. I even tried the 710's factory card and same results. Maybe I'm missing something really simple here.
I have a trip coming up next week so I will try your solution when I get back home if I can't get this to work before Monday. The 710 is quite underpowered compared to my 430 so I do not mind shelving it for a proper box (it was a retired system from my work anyway).