An initiator node adapted to provide quality of service (QoS) for an Internet Small Computer System Interface (iSCSI) environment is provided. The initiator node including an iSCSI initiator comprising a QoS shaper, the QoS shaper for shaping one or more Protocol Data Units (PDUs) according to QoS policies and providing shaped PDUs, and a Transmission Control Protocol (TCP) layer for receiving the shaped PDUs from the iSCSI initiator and comprising a QoS marker for marking the shaped PDUs according to the QoS policies, wherein the PDUs are command PDUs and wherein the shaper shapes the command PDUs before the command PDUs receive command sequence numbers.