HP 1606 FICON Administrator's Guide v6.4.0 (53-1001771-01, June 2010) - Page 64

Triangular topology, Flow B

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5 Traffic Isolation Zoning • Brocade 5300 • Brocade 7800 • Brocade DCX • Brocade DCX-4S Triangular topology The triangular topology shown in Figure 15 is a common FICON deployment for managing data center recovery functions. In this topology, a director is located in each of three sites and connected to the other two forming a triangle. In most environments, the purpose of this configuration is to give the host application the ability to connect to storage media at the other two sites, which allow it to recover from an outage at either site. Meanwhile, the storage systems constantly synchronize between the two storage sites. Channel Flow A Flow B ISL 1 ISL 2 ISL 3 Flow C CU A CU B FIGURE 15 Typical triangular setup During normal operation, the routes from any device on one director are a one-hop path to either of the other two directors. However, if the path between any pair of directors fails then a two-hop path is available. Multi-hop paths are not certified for FICON configurations. 52 FICON Administrator's Guide 53-1001771-01

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52
FICON Administrator’s Guide
53-1001771-01
Traffic Isolation Zoning
5
•
Brocade 5300
•
Brocade 7800
•
Brocade DCX
•
Brocade DCX-4S
Triangular topology
The triangular topology shown in
Figure 15
is a common FICON deployment for managing data
center recovery functions. In this topology, a director is located in each of three sites and
connected to the other two forming a triangle. In most environments, the purpose of this
configuration is to give the host application the ability to connect to storage media at the other two
sites, which allow it to recover from an outage at either site. Meanwhile, the storage systems
constantly synchronize between the two storage sites.
FIGURE 15
Typical triangular setup
During normal operation, the routes from any device on one director are a one-hop path to either of
the other two directors. However, if the path between any pair of directors fails then a two-hop path
is available. Multi-hop paths are not certified for FICON configurations.
CU B
CU A
ISL 3
ISL 1
ISL 2
Flow B
Flow C
Flow A
Channel