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Boot from iSCSI. How does it work?

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http://serverfault.com – I have a Supermicro 2uTwin2 blade server which we're hoping to run XenServer on. Because this motherboard only provides Intel's fakeraid, I was hoping to leverage its boot from iSCSI functionality to get some redundancy. I can't figure out how this is meant to work. My best guess would be that the NIC acts like an HBA, allowing me to boot off a CD and then install the OS onto the NIC-based disk. However this doesn't seem to be the case. I can define an iSCSI target in the BIOS, and when the server boots I see it connect momentarily. Then it seems to disconnect and move-on. So, my quest (HowTos)