How to tell server model/type

I suggest running a sysreport. As root, simply type sysreport, hit enter and follow the intstructions when it is done collecting your info. If you want to run it without collecting package info (which can take quite a while) use the -norpm switch. It generates a compressed file, after you untar it you will have a directory containing all your system information. One of the files is called "hardware.py" cat hardware.py and grep it for the word "system" - this will show not only the model, but the serial number and bios version.