25150a
SONET
FC-SONET
Local
FC-SONET
Remote
Figure 86 FC-SONET dual-link configuration
.
In a dual-link configuration, HP recommends that you limit the maximum sustained I/O load to 40%
of the maximum available bandwidth for each link. This allows for instantaneous bursts of I/O activity
and minimizes the effect of a link failure on performance.
FC-SONET shared-link configuration
A shared-link configuration uses only one ISL between fabrics (Figure 87).
25151a
SONET
FC-SONET
Local
FC-SONET
Remote
Figure 87 FC-SONET shared-link configuration
.
NOTE:
Do not use the shared-link configuration if you require high availability because it does not provide
redundancy between fabrics. It can also decrease performance because the total bandwidth available
for storage is shared by the two fabrics.
FC-SONET network considerations
Implementing FC-SONET with your existing network depends on the expected storage replication
application load and existing network traffic. The key consideration is whether you have enough
unused or available bandwidth from your network to support the current network load, accommodate
future growth, and handle replication load demands.
HP supports the use of SONET with XP Continuous Access (see ATM and SONET/SDH on page 344).
Third-party SONET gateways
For a list of HP-certified third-party SONET gateways, see
“Certified third-party WDM, iFCP, and SONET products” on page 352.
Fibre Channel over ATM
Direct FC-to-ATM conversion is supported by the Fibre Channel standards. However, currently, no
vendors sell direct FC-to-ATM gateways. If you have an ATM-based network, consider using FC-to-GbE
SAN Design Reference Guide 297
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