Fujitsu MBC2073RC, MBC2036RC, MBA3300RC, MBA3147RC Pathways, Example of potential pathways

1.1 Topologies in SAS Interface

1.1.5 Pathways

A potential pathway is a set of physical links between a SAS INIT phy and a SAS TARG phy. When a SAS INIT phy is directly attached to a SAS TARG phy, there is one potential pathway. When there are expander devices between a SAS INIT phy and a SAS TARG phy, there are multiple potential pathways, each consisting of a set of physical links between the SAS INIT phy and the SAS TARG phy. The physical links may or may not be using the same physical link rate.

A pathway is a set of physical links between a SAS INIT phy and a SAS TARG phy being used by a connection.

Figure 1.6 shows examples of potential pathways.

Figure 1.6 Example of potential pathways

A partial pathway is the set of physical links participating in a connection request that has not reached the destination phy (e.g., the OPEN address frame has been transmitted by the source phy but the OPEN address frame has not yet reached the destination phy).

A partial pathway is blocked when path resources it requires are held by another partial pathway.

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