When we were initially designing our iSCSI SAN environment, we plannedto use jumbo frames; it was just an obvious thing to do. Then we triedto find an inexpensive 16 or 24 port gigabit Ethernet switch thatactually did jumbo frames completely correctly.

To skip to the punchline, we failed. Worse, in the process offailing it became obvious that jumbo frames were a dangerousswamp. (Since jumbo frames did not get us any real performanceincrease , we didn't then try expensive switches.)