Different from traditional IP switches

the iSCSI virtualization switch not only realizes the IP packets transmission

but also performs the processing of TCP

iSCSI and SCSI protocol.The short packet first scheduling algorithm insures the priority transmission of iSCSI command and status PDUs (Packet Data Unit)

but does not impose restrictions on the forwarding bandwidth of such packets.Moreover

it is lack of quantitative analysis on iSCSI data flow characteristics for this method.The mathematical model of iSCSI PDUs forwarding process within the iSCSI virtualization switch was created by queuing theory.Then the packet scheduling algorithm called FC-WFQ (Flow Control-WFQ) was designed for the iSCSI virtualization switch used in the SANs.Finally the iSCSI virtualization switch with FC-WFQ was tested under certain network scenarios built by ns-2.In the experiments

while the command arrival rate and the ratio of read/write commands were changing

the FC-WFQ dynamically adjusted the forwarding bandwidth weight of each packet flow correspondingly.The results show that the scheduling algorithm can greatly reduce the mean response time of the read/write tasks

and significantly improve the throughput of the iSCSI virtualization switch.