Storage Area Networks: Designing and Implementing a Mass Storage System
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3.14 Classes of Service
Fibre Channel classes of service are managed by the FC-2 level. Currently the following five classes of service are defined by the standard:
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Class 1 ”Dedicated connection service.
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Connection-oriented
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Acknowledged delivery
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Class 2 ”Multiplexed service.
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Connectionless
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Acknowledged delivery
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Class 3 ”Datagram service. The device drivers determine if data is not received and needs to be retransmitted.
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Connectionless
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Unacknowledged delivery
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Class 4 ”Fractional service. It uses a fraction of the bandwidth of the link between two ports for communication.
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Connection-oriented
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Class 6 ”Unidirectional Dedicated Connection service. It provides dedicated unidirectional connections.
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Connection-oriented
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Classes 4 and 6 are defined, but are not widely implemented. Other classes of service may follow. However, they are currently not defined.
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