Physical overview of the hardware:

StarWind Free

Great product to build your own ISCSI based SAN. It is compatible with Server 2003 Clustering and supports SCSI-3 Persistent reservation bit.

StarWind Free is an iSCSI Target that converts any Windows server into a SAN in less than 10 minutes.  This is a fully functional product at no cost. 

• Large 2 TB storage capacity
• Unlimited number of connections
• Virtualization environment support for VMware, Hyper-V, XenServer, Virtual Iron
• Enhances VMware environments by enabling VMotion, VMware HA, DRS and VCB
• Supports Windows server clustering for any application including SQL Server, Exchange, SharePoint

More info @: http://www.starwindsoftware.com/free