There is no reason why it should not work. Make sure you have properly configured zoning for FreeNAS FC WWPN on your FC fabric (if you have one) and access right for your LUN on your target. If still does not work -- show what you have, because it is difficult to diagnose without information.
I have had a few servers boot from SAN using a FC target on FreeNAS 9.3. My setup wasn't a Cisco UCS, just a standard rack server. Using Qlogic and Emulex fibre cards I just had to enable the bios in the FC HBA and tell it the LUN number to boot from. Then in the server's bios I had to tell it to boot from the FC card. I set my LUN ids on FreeNAS to 0 when I use it as a boot LUN as some older firmware will only boot to LUN 0.
I'm trying the same thing. I have two noob questions:
First - How do you assign a LUN to a QLogic HBA (QLE2462)(server side) so it can boot from FreeNAS?
Second - Thoughts on introducing / configuring a Cisco SAN 9124 fibre channel switch to the mix? I assumed it would be just like any other network switch, however the drive is only visible when directly connected. Adding the switch into the middle (with ports no-shut and proper sfp's) shows that both FreeNAS and my server HBAs connect to the switch, but the drive is no longer visible on my server.
Please note that I am using FreeNAS 11 stable. The drive is visible (and completely usable) when directly connected via Fibre Channel, and works well.
This a personal project to gain exposure to this technology, and I've been working on it for weeks! This is my first time working with Fibre Channel tech. I can access the HBA config settings from my MB's UEFI.
Thank you!