I strongly recommend a visit to StarWind’s website to read about the upcoming release of StarWind’s iSCSI target software software. I usually explain what it is to people by calling it a software SAN for Windows servers.
Any Windows server can be made into a SAN by using StarWind’s software. However, version 5.0 adds automated failover between servers to provide fault tolerance for the storage.
For more info, visit the StarWind site at http://www.starwindsoftware.com/starwind-v5-preview.
I am really excited about this upcoming release and what it means to high availability.