Specifications

Fibre Channel Over SONET (FC-SONET)
44 Continuous Access and Data Replication Manager SAN Extensions Reference Guide
Shared SONET link for dual ISLs
A shared SONET-link configuration, as shown in Figure 11, uses one ISL between
each of the fabrics. While it is workable, this configuration is not recommended
because it does not allow redundancy between SAN islands. Performance is
similar to the dual-link configuration due to the ability of SONET to completely
isolate bandwidth on a single network interface.
Figure 11: Shared-link SONET minimum configuration
Considerations relevant to using the existing SONET network
The ability to use your existing network with FC-SONET depends on the type of
storage replication you plan to do, and the existing network traffic. The key
consideration is whether you have enough unused or available bandwidth from
your network to continue the current network load, accommodate future growth,
and handle replication load demands.
Network speeds
In general, FC-SONET equipment supports speeds up to full rate Fibre Channel.
The network connection should be selected to match the amount of data to be
replicated. SONET provides WAN interfaces of OC-3 (155 Mbps), OC-12
(622 Mbps), and OC-48 (2.5 Gbps).
Switch W
Switch Z
Switch Y
Switch X
CXO8297A
SONET
FC-SONET
Gateway
FC-SONET
Gateway