I confirm the Intel® Server Board S5000VSA is not among the supported boards for the Intel® RAID Controller RS2WC080 (click here). This explains as to why your RAID controller card does not detect any of the drives in the backplane. For a list of validated hardware RAID controllers for the board in question, please, refer to the tested hardware and operating system .pdf file found here.
Finally, I confirm there is no 3 Tb. drive size support on the Intel® Server Board S5000VSA as you indicated.