电子学报2013，Vol.41Issue(3)：587-592,6.DOI:10.3969/j.issn.0372-2112.2013.03.028
iSCSI虚拟交换机包转发调度算法FC-WFQ
Packet Forwarding Scheduling Algorithm FC-WFQ for iSCSI Virtualization Switch
摘要
Abstract
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.关键词
SAN/SCSI/iSCSI虚拟交换机/调度算法/WFQ/排队模型Key words
SAN/ SCSI/ iSCSI virtualization switch/ scheduling algorithm/ WFQ/ queuing modelc分类
信息技术与安全科学引用本文复制引用
韩永,姚念民,蔡绍滨,陈金忠..iSCSI虚拟交换机包转发调度算法FC-WFQ[J].电子学报,2013,41(3):587-592,6.基金项目
国家自然科学基金(No.61073047) （No.61073047）
中央高校基本科研业务费专项基金(No.HEUCFT1007,No.HEUCF100607) （No.HEUCFT1007,No.HEUCF100607）
