HP XP Racks - Manual (Page 34)

Set port topology to: Fab off, FC-AL.
Switch connection
The following figure shows a switch connection, in which up to three optical fibre cables are
connected using switches. Two switches can be used.
•
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).
•
Host I/O response time can be improved on long distance switch connections by using host
mode options 49 and 50, or 51. The following table describes these options for the 16FC8
package. A HP-approved channel extender is required.
Description Host mode options No
Fixes higher values of buffer-to-buffer credits (BBCs) to increase data
transfer size over long distances
1
. This host mode option must be used
in conjunction with host mode option 50.
2
BB Credit Set UP
Option 1 49
Fixes higher values of buffer-to-buffer credits (BBCs) to increase data
transfer size over long distances
1
. This host mode option must be used
in conjunction with host mode option 49.
2
BB Credit Set UP
Option 2 50
Improves host I/O response time for long distance switch connections.
2
Round Trip Set UP
Option 51
1. Up to 100 km.
2. The microcode supporting these functions must be installed on both the primary and secondary system
Extender connection
The following figure shows an extender connection, in which channel extenders and switches are
used to connect the devices across large distances.
34 Planning for Continuous Access Synchronous