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11Continuous Access and Data Replication Manager SAN Extensions Reference Guide

About SAN Extensions

In the global environment, companies with storage area networks (SANs) cannot

be limited by distance. Putting distance between SAN islands is important for

creating a disaster-tolerant data environment. This document describes support for

several technologies that overcome the distance limitations of Fibre Channel

connections:

■ Fibre Channel over IP

■ Wavelength division multiplexing

■ Fibre Channel over SONET

■ Long-distance optical transceivers

These SAN extension technologies work closely with Fibre Channel switches

because the switches are the transport mechanisms between elements of the SAN.

Testing and certification of SAN extension products is usually across different

switch product lines with associated data rates, and with the latest available

version of switch firmware. Three types of HP Fibre Channel switch product lines

are supported with SAN extensions:

■ B-series

■ C-series

■ M-series

To see the list of models in these product lines, refer to the HP StorageWorks SAN

Design Reference Guide.

Interswitch links (ISLs) using fiber optic cable can only achieve a distance of 10

kilometers at data rates of 1-gigabit per second (Gbps) or 2-Gbps. Any technology

that allows a user to exceed this limitation is a SAN extension (see Figure 1).

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Riverstone Networks RS 2100 Especificaciones Pagina 11