Some read about iSCSI connection and deployement guide
There is a good PDF to read if you want to lear some more about iSCSI and ESX Server. Even if iSCSI is not as widely used in big data centers, this could be a smart solution for the SMB market. Even if the performances are not as good comparing to Fibre Channel SANs. The price of FC SAN is often double or triple. iSCSI is younger and has still a lot to prove comparing to FC. The stability and performance are getting better as it becomes more widely deployed, but it does not yet generally provide as high performance as Fibre Channel SANs.
A basic difference between iSCSI and Fibre Channel is that when an iSCSI path is overloaded, the TCP/IP protocol drops packets and requires them to be resent. Fibre Channel communications over a dedicated path are not at risk of being overloaded. When a network path carrying iSCSI storage traffic is oversubscribed, a bad situation quickly grows worse and performance further degrades as dropped packets must be resent….

Have a nice read. You can find the pdf here.
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