Qos control method for iscsi

A quality of service (QoS) control method for an internet small computer systems interface (iSCSI), comprising:

• presetting two variables, wherein one of the two variables, bucket (a bucket capacity), indicates a traffic allowed by one QoS control object for iSCSI within one second, and the other variable, bucket used (a used bucket capacity), indicates a number of bytes actually transmitted during the current one second;
• receiving a protocol data unit (PDU) sent from a connection;
• if the received PDU carries or requests data, adding lengths of the data carried or requested by the PDU during the current one second and storing the obtained result in the variable bucket_used;
• and
• determining whether the variable bucket_used is larger than the variable bucket or not, if yes, suspending a current QoS control object for iSCSI and accepting no additional new PDU handling until the end of the current one second, and if not, forwarding the PDU to an iSCSI PDU handler for subsequent execution.