13. Synchronization and Steering

As I began writing this book, there were two techniques before the IETF dealing with the synchronization and steering of iSCSI data. One is included in the base iSCSI document since it only applies to iSCSI. Called fixed interval marking (FIM), it involves placing markers directly in the TCP/IP stream that will identify the start of iSCSI PDU headers. The other technique, a framing proposal, is called TCP upper-level-protocol framing (TUF). Since TUF is also applicable to non-iSCSI upper-level protocols (ULPs), it has another path through the IETF standards group and will be only lightly covered here. As I complete this book, another proposal has been developed. I call this TUF/FIM, as it is based on both TUF ...

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