For years, when you need to define a Windows Storage as iSCSI target, you need a paid software, cause Microsoft iSCSI target software did only run on the Windows Storage Server edition.
As of April 2011, the target software is now available for free and supported in any Windows 2008 R2 edition!
You can use this for:
- highly available VMs
- clustering of file and print services
- testing environments
You can download it here:
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=45105d7f-8c6c-4666-a305-c8189062a0d0