Managing Superdome Complexes: A Guide for HP-UX System Administrators

Planning Superdome Configurations
Building Blocks and Definitions
Appendix A316
U-Turn (32-way-capable-system)
+------+
| | B
| XBC0 |------
| |
+------+
A| |C
| |
+------+
| | B
| XBC4 |------
| |
+------+
In this figure, C shows a second XBC-XBC link (a flex link) between XBCs
in the same cabinet. This is a U-Turn configuration for a
32-way-capable-system. Note that the ports labeled B are not connected
to anything.
Cross-Flex (64-way-capable-system)
+------+ +------+
| | B | |
| XBC0 |----------| XBC8 |
| | | |
+------+ __ +------+
A| \C /D A|
| \___/___ |
| ____/ \ |
+------+ +------+
| | B | |
| XBC4 |----------|XBC12 |
| | | |
+------+ +------+
This figure shows XBC-XBC links (C and D) connecting XBC 0 to XBC
12, and XBC 8 to XBC 12, in the other cabinet. This is a Cross-Flex
configuration for a 64-way-capable-system.
See “Recommendations for Cabling Crossbar Controllers (XBCs)” on
page 324 for guidelines on when to use which type of configuration.