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

Planning Superdome Configurations
Rules and Guidelines for Configuring a Complex
Appendix A 339
is primarily connected is disabled (or one card or any single
connection fails).
Paths to boot
and root disk
For a partition performing mission-critical tasks, configure the
following paths to the boot device:
1. Primary attached to one viable core cell.
2. Secondary attached to the same viable core cell.
3. Primary attached to a second viable core cell:
+---------+ +---------+
| first- | | second- |
| choice | | choice |
| core | | core |
| cell | | cell |
+---------+ +---------+
| \ /
1| 2\ /3
____|____ \ / _________
<_________> \ <_________>
| primary |__/ \__|alternate|
| boot/ | | boot/ |
| root | | root |
\_________/ \_________/
This allows for automatic reboot upon any single failure.
In the above diagram, the “first-choice core cell” should be the
lowest-numbered cell in the partition; the “second-choice core cell”
should be the second-lowest-numbered cell in the partition.
• Attach more than one viable core cell in each partition to the network.
This will allow the partition to reboot and continue to function even if
one core cell is disabled, or one card fails.
• Place cards in an I/O chassis in the following order (bearing in mind
that the core I/O card, if there is one, must always be in the first slot):
1. boot device cards
2. data device cards
3. networking cards
4. other cards