Jose Barreto posted a few weeks ago about Windows Storage Server 2008 and the MS iSCSI software target being available on TechNet and MSDN. I can’t say I remember it being available like this but I could be wrong. Normally this was OEM only. A few of us were lucky enough to get the iSCSI bits directly from contacts in MS for testing and blogging purposes.
With this OS, you can create a storage server that can give you an economic shared storage solution for testing clustered services, e.g. SQL or even Hyper-V.
Credit: Tim Berk