can anyone tell me what an FA pair is, in SAN storage? thank you.
FA in SAN language usually refers to Fiber Adapter. Those are the cards in the storage box that you plug the fiber cables into. On the server side the card you plug the cables into is usually called a HBA for Host Bus Adapter.
Only for complement the preview answer, the "FA pair" means that you must be connect your server at least at two FA channels for redundancy.