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Fibre Channel Over IP

14 Continuous Access and Data Replication Manager SAN Extensions Reference Guide

Single link

The connection between switches linking two sites is called an interswitch link

(ISL). A fabric is a network of one or more FC switches. Figure 2 shows an FCIP

gateway connection in a single-link fabric.

Figure 2: Single link IP configuration

Dual links

Some configurations use two (dual) ISLs for redundancy. This configuration is

common where high availability is a requirement. Two disaster-tolerant solutions

that have been tested and are supported with this configuration are the HP

StorageWorks Continuous Access EVA or Data Replication Manager (DRM). A

dual link configuration (see Figure 3) is the benchmark for disaster protection,

because if one link fails, the other link will temporarily handle all data replication.

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

different providers for the two ISLs, including different entries into the data

center.

Figure 3: Dual link IP configuration

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

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

allows for instantaneous bursts of I/O activity, and it minimizes the performance

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

the surviving link.

FC Switch A

FCIP

equipment

FCIP

equipment

FC Switch Y

CXO8181A

FC Switch A

FCIP

equipment

FCIP

equipment

FCIP

equipment

FCIP

equipment

FC Switch Y

FC Switch Z

CXO7794B

FC Switch B

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