|Our 10 GB switches don't have iSCI connections. Our SAN/NAS is rather a large one and it uses FiberChannel connectors between the SAN/NAS heads and the units themselves and have dedicated fiberchannel switches built into the racks.|
As far as I know, our switches don't use "packet buffer memory" but each manufacturer has a tendency to reinvent the wheel when it comes to naming things so I could be familiar with this under another name.
Our 10 GB switches are non-blocking so we get the full 10 GB across all connectors.
I would say you need to compare throughput on the two different connectors and go with whatever is going to give you what you the best throughput.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.