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iSCSI: The Universal Storage Connection by John L. Hufferd

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8. Command and Data Ordering and Flow

To the Reader

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This chapter will present the details of flow control for both commands and data. It will take the concepts introduced in Chapter 7 and expand them. As always, if you desire just an overview, skip to the Chapter Summary.

Command Ordering

Commands such as read and write are sequenced by iSCSI initiators so that the iSCSI target can present them to the target SCSI layer in the order in which they were sent. As specified in Chapter 7, to do this each command is given a unique number, called the command sequence number (CmdSN), which is placed in the header of the various request PDUs ...

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