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Multiple network cards and multiple connections in iSCSI are important ways to improve iSCSI systems performance, fault tolerance and scalability. But multiple connections technology cannot assign every task appropriately, so it cannot produce the excellent performance. This paper proposes a dynamic load balancing algorithm using a feedback control mechanism to improve the overall performance in iSCSI systems. In order to adjust the load state dynamically, this algorithm adopts a feedback mechanism to calculate multiple resources states that have been collected in this system, and then combines the results and the previous feedback. The test results indicate that with the help of this algorithm the performance of iSCSI system has been improved.