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Fibre Channel Over SONET (FC-SONET)

43Continuous Access and Data Replication Manager SAN Extensions Reference Guide

Dual links

A dual-link configuration is the benchmark for disaster protection, because if one

link fails, the other link will temporarily handle all data replication. A dual link

configuration that is only partially redundant is shown in Figure 10.

For enhanced fault tolerance, a customer may choose to contract with two

different providers for the two interswitch links (ISLs), including different entries

into the data center.

In the dual-link configuration, HP recommends that the maximum sustained I/O

load be limited to 40 percent of the maximum available link bandwidth. This limit

allows for instantaneous bursts of I/O activity as well as minimizing the

performance effect of a single link failure, during which the entire I/O workload is

carried by the surviving link.

Figure 10: Dual-link SONET configuration (partially redundant)

Switch W

Switch Z

Switch Y

Switch X

CXO8296A

ISL- Black

Fabric

ISL- Gray

Fabric

SONET

FC-SONET

Gateway

FC-SONET

Gateway

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Riverstone Networks RS 2100 Especificaciones Pagina 43