I need two 8 port gigabit switch for my MD3000i and 3 dell servers.
Which switches provide maximum performance?
I think you will struggle for such a small switch for business use - netgear do cheap and cheerful desktop switches. I would go back to the dell web site and buy 2 from them - they will probably be 16/24 port switches but you will get the performance and features you are looking for.
I think the switch Dell PowerConnect 2808 is suitable for this
Perhaps look at the HP line, for example the HP 2520-8G-PoE supports Jumbo Frames and Flow Control (and many other cool features like VLAN, port aggregation, 802.1p priority and more.)
http://h18000.www1.hp.com/products/quickspecs/13525_div/13525_div.HTML
You need at least two switches for a iSCSI configuration for storage HA.