During the last days I did some tests with a new player in the iSCSI Software Market.
OsNexus. They have a very smart iSCSI Software, and you can use it for free. So this is great for testing.
There are a lot of free iSCSI Targets available, but this is one which has full StorageLink Support.
You should download the XVA virtual Appliance for XenServer. XenTools are already installed, so you will get a very good performance.
So with this software it’s very easy to setup a test / demo environment without investing a lot of time or money.
Have a great day