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

Planning Superdome Configurations
Rules and Guidelines for Configuring a Complex
Appendix A 335
Then continue by assigning the second I/O chassis to the first cell in the
next partition; continue until all partitions in (or beginning in) this CPU
cabinet have an I/O chassis inside the CPU cabinet attached to their
lowest-numbered cell; each of these chassis should contain a core I/O
card. Then start over with the first partition and assign additional
chassis (including chassis in an expansion cabinet, if any) to the
partitions as needed.
When loading and assigning chassis, keep the following considerationsin
mind (some of these are discussed in more detail in the rules and
guidelines that follow):
• A partition’s core cell (the cell it boots from by default) should
normally be its lowest-numbered cell.
• Each partition’s core cell should be attached to an I/O chassis inside
the CPU cabinet if possible.
• When configuring additional (alternate) core cells for a partition, use
the partition’s next lowest-numbered cells, and, if the partition
crosses CPU cabinet boundaries, use the cells in the left cabinet first.
For example, if you want to attach core I/O to three cells in a partition
that comprises seven cells in the left cabinet and two in the right,
attach the three chassis containing core I/O cards to the partition’s
three lowest-numbered cells in the left cabinet.
• The I/O chassis in the rear of the CPU cabinet are easier to work
with.
• It is better not to cross System Bus Adapter cables.
The four cables on the left should attach to the four left cells and the
four cables on the right to the four right cells.
• Allow for future expansion.
For example, if you plan to add cells to this CPU cabinet in the future,
and they will form a new partition, leave a slot to add an I/O chassis
(to be attached to the new partition’s core cell). See “Guidelines for
Expandability” on page 340.