Creating a Windows failover server cluster using internal SATA RAIDs

I have 2 new IBM servers with identical hardware, including QLogic fibre HBAs and internal SATA mirrored RAIDs. They both run Windows 2008 Enterprise server. They are located in 2 server rooms which are joined by a fibre bundle and located in separate buildings. I know very little about clustering, but I would like to cluster these servers to prevent downtime in case of power outages or server software upgrades. I was hoping that I could link these servers directly together and store mirrored copies of data on both servers' internal hard drive arrays. But the reading I've done on Microsoft clustering all deal with using a shared external storage array. Is there a way to host the clustered data directly on my servers, and link them to each other via dedicated fibre or ethernet? Thank you.