iSCSI

FCP recover frame loss by retransmitting the frame. iSCSI relies on TCP to recover lost data packet. Because iSCSI on IP, there is no distance limit. iSCSI fabric has not intelligence like FCP. iSNS combines features from FC SNS with DNS. Devices registered iSNS on a well-known IP address. iSNS could be implemented by an attached devices or embedded in the iSCSI switch. Once the initiator and target established the session, the iSNS is no longer required in the communication.