HP StorageWorks MSA 2/8 HP StorageWorks QuickLoop Fabric Assist V3.1.x User Gu - Page 19
QuickLoop Topology
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Using QuickLoop QuickLoop Topology QuickLoop topologies have the following characteristics: ■ A QuickLoop can include up to two switches and can support up to 126 AL_PA devices. ■ Each particular switch can only be included in one QuickLoop. ■ A QuickLoop can include either all of, or a subset of, the ports on a particular switch. ■ Multiple non-overlapping QuickLoops can exist in a fabric of multiple switches. ■ Switches with QuickLoop enabled can exist in the same fabric as non-QuickLoop enabled switches. ■ A device attached to a QuickLoop can communicate with all other devices attached to the same QuickLoop. ■ A private device in a QuickLoop can only communicate with devices in the same QuickLoop. Existing PLDA capable host drivers need no modification to perform I/O operations with storage devices. ■ Public devices that are arbitrated loop capable are treated as private devices when connected to QuickLoop ports (their Fabric Login (FLOGI) is not valid). ■ Legacy devices may be used in a QuickLoop and may be attached to a fabric and operate as if in a PLDA environment. ■ QuickLoop functionality can be enabled or disabled for either the entire switch or for particular ports. When QuickLoop is disabled on a particular port, that port returns to Fabric mode. ■ If a looplet error is detected, QuickLoop automatically takes that looplet out of service. If the error condition is cleared, the looplet is automatically reinstated. QuickLoop Fabric Assist Version 3.1.x User Guide 19