Flow control is an important network function for iSCSI SANs.  I had a question come up on it at my Storage@work site in a comment and I thought I'd put the same information out here in this blog entry:

If you have a sample configuration for the iSCSI and Cisco Switch configuration, that would be very helpful. 

There is a document on our web site listed on this page (under the category of network switching).  You can download after registering.

http://www.equallogic.com/resources/technicaldocumentsview.aspx?id=364

There's a lot of stuff in the doc, but the section on flow control has this:

The following commands shows how to configure Gigabit Ethernet interface 0/1 on switch 1 to
auto-negotiate the correct Flow Control setting with the device to which it is connected:

Switch> enable
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# flowcontrol receive desired
Switch(config-if)# exit
Switch(config)# exit
Switch# copy running-config startup-config

To view or confirm Flow Control status on a port, use the following command:

Switch# show flowcontrol interface gigabitethernet1/0/1