Fibre Channel Service Classes
The Fibre Channel standard defines six service classes for exchange of data between end devices. Three of these defined classes (Class 1, Class 2, and Class 3) are realized in products available on the market, with hardly any products providing the connection-oriented Class 1. Almost all new Fibre Channel products (HBAs, switches, storage devices) support the service classes Class 2 and Class 3, which realize a packet-oriented service (datagram service). In addition, Class F serves for the data exchange between the switches within a fabric. Class 1 defines a connection-oriented communication connection between two node ports: a Class 1 connection is opened before the transmission of frames. Class 2 and Class 3, on ...
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