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HP XP P9500 User Manual Page 36

Continuous access synchronous for mainframe systems.
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Table 19 Host mode options for long-distance remote copy connection (continued)
Host mode options
Round Trip Set UP
For using the function of fixing the number of BB Credit, you must set both of the host mode
options, 49 and 50.
Host mode options 49, 50, and 51 are enabled for the 8UFC or 16UFC package.
Switch connection—up to three optical fiber cables are connected using switches. Up to two
switches can be used, as shown below.
Figure 5 Switch connection
Set port topology to the following:
NL port: Fab on, FC-AL
N port: Fab on, Point-to-Point
Some switch vendors require F port (for example, McData ED5000).
Extender connection—channel extenders and switches are used to connect the devices across
large distances, as shown below.
Figure 6 Extender connection
Set port topology to the following:
NL/FL port: Fab on, FC-AL
F port: Fab on, Point-to-Point
Best practice is to create at least two independent data paths (one per cluster) between the
main and remote system for hardware redundancy for this critical element.
When 4,000 pairs or more are used, we recommend that you restrict the number of pairs
when creating pairs, so that 4,000 pairs or less use one physical path, to distribute load on
the physical path.
Planning for Continuous Access Synchronous Z
When to select this options
Use this option combining with host mode option 49.
Use this option if you want to fix the response time of the host I/O due to long
distance (approximately 100 km) between MCU and RCU for the Cnt Ac-S Z
pairs without switches.


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