You can't mix SAS and SATA in a RAID array.
Dear Members, I have Dell PowerEdge 2950 Server Which i need to install Windows 2003 Standard Edition and keep it as File Server for my network. So i bought 2TB SATA WD HDD, I would like to create RAID 1. As a try i connected two 145GB SAS and one 2TB SATA in the bay and switch ON to create RAID1.  Please guide me how to create RAID 1 using PERC 5/i configuration utility? My PERC version 5/i Integrated 5.0.2.0003.  Thanks  Tony 
DELL PowerEdge 2950 PERC 5/i