Hi every body,
Is it possible to connect two servers Back-to-Back (Point-to-Point) using HBA adapters & using Fiber.
Note it is direct connection & there is no switches between the servers.
I'm concern about using HBA adapters, it is possible or not.
Thanks in advance. 
Given that "host bus adapter (HBA) connects a host system (the computer) to other network and storage devices" I guess the answer is yes, but this will depend on the type of hardware you have.
I remember hearing about Sun doing something with this a while back, unfortunately the name escapes me. They did it using Fibre IO HBAs. You can get some stupidly fast data transfers over it but it requires a dedicated connection and as far as I know is a Sun-only thing 
I know it's a old topic. I search for something on goolge find this.
Basicly, it's possible, FC P2Plink is part of hardware protocol, IPv4 over FC is somewhat industry standard. But may be limited by platform that if it provide software to support.
Under AIX, it's absoluted no problem.
SMIT to Enable FC Network Device
cfgmgr
smit chinet fc0, config tcpip. that's it.
When you config it, the Fibre link has to be connected, either HBA to HBA, or to FC switch or FC SAN switch.