HP Surestore 64 FW 05.01.00 and SW 07.01.00 HP StorageWorks SAN High Availabil - Page 74
Arbitrated loop to switched fabric connectivity
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Planning Considerations for Fibre Channel Topologies The switch B_Port provides a single 1.0625 Gbps ISL to an E_Port on a director or edge switch. Direct ISL connectivity between loop switches (with or without a redundant B_Port connection to a director or edge switch) is generally not supported. However, a director or edge switch does support the connection of multiple, independent switches. Figure 31 shows a configuration of two loop switches attached to a director. Figure 31: Arbitrated loop to switched fabric connectivity Consider the following when planning arbitrated loop-to-switched fabric connectivity and incorporating FC-AL devices into the enterprise SAN environment: ■ B_Port traffic is routed through a user-transparent FL_Port that is embedded on the switch's control processor (CTP) card. Switch mode (shared or switched) has no impact on B_Port operation. However, because all switch-attached FC-AL devices must arbitrate for access to the embedded FL_Port, loop performance issues (loop round-trip time, number of loop tenancies, service rate, and loop utilization) must be evaluated. 74 SAN High Availability Planning Guide