HP Surestore 64 FW 05.01.00 and SW 07.01.00 HP StorageWorks SAN High Availabil - Page 61
Shared mode operation, and server S
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Planning Considerations for Fibre Channel Topologies Figure 21: Shared mode operation ■ Switched mode - When set to switched mode or by default, the switch bypasses full loop arbitration and enables frame transmission through logical connected device pairs. Connections can be established between H_Port pairs, or between an H_Port and fabric loop port (FL_Port). Switched mode also allows independent operation of looplets of devices, each connected through an unmanaged hub, and each attached to a single switch H_Port. Because of opportunistic bandwidth sharing, all looplets or connected device pairs operate half duplex or full duplex at 1.0625 Gbps. Switched mode operation is illustrated in Figure 22. Part (A) shows four device transmission pairs using all eight H_Ports (server S1 to device D1, server S2 to device D2, server S3 to device D3, and server S4 to device D4). All four transmissions operate independently at 1.0625 Gbps. Subsequently, part (B) shows two device transmission pairs using four H_Ports (server S2 to device D2 and server S3 to device D3), and public device D1 connected to fabric-attached server S5. All four transmissions operate at 1.0625 Gbps. SAN High Availability Planning Guide 61