I have a  Dell T610 server running Windows Sever 2003 and Hyper V.  I have one Virtual server.  My system drive is almost out of space and my raid is as well.  I currently have a 5 drives installed and 3 of the drives are part of the RAID5  I am assuming ( I am not sure) that the other 2 drives are RAID 1 for my system drive.   How do I increase my system drive space and my Raid 5.  It is the PERC 6/i controller as RAID5 

I looked in the PERC software and I can see on Virtual Disk of Raid 5.  I did not see anything about the system drives. 

Can I just   I have 3 empty bays for disks. Can someone please give me some guidance.  Do I just buy drives and add them?  Any tips.

My job security is at stake here