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

Planning Superdome Conﬁgurations

Rules and Guidelines for Conﬁguring a Complex

Appendix A334

That is, the cell that is attached to the I/O chassis must not only have

been assigned to the partition, but also powered on and booted; see

“What Happens when a Cell Boots” on page 311.

•A 16- or 32-way-capable system should have at least two I/O

chassis, and a 64-way-capable system should have at least four I/O

chassis.

• The failure of a cell or an I/O chassis will bring down the partition it

belongs to, but you can provide redundancy that will allow you to

reboot the partition with a minimum of downtime; see “Guidelines for

High Availability” on page 338.

When planning or reconﬁguring a complex, ﬁrst map out the partitions,

then plan the I/O for each partition as you would for a single system,

then assign the I/O to individual cells following the rules and guidelines

below.

Loading and Assigning I/O Chassis

As shipped from the factory, I/O chassis will be loaded into the CPU

cabinet and assigned to cells in the following order:

It’s a good idea to keep to this order when you add I/O chassis to an

installed system.

Given the above layout, populate an empty CPU cabinet as follows.

Attach the ﬁrst I/O chassis (I/O chassis 3 on the right of I/O bay 1, in the

rear of the CPU cabinet, or in the rear of the left CPU cabinet if this is a

64-way-capable system) to the lowest-numbered cell in the

lowest-numbered partition in the complex. This chassis should contain a

core I/O card.

I/O Bay# Chassis# Position

1 3 rear right

0 1 front left

1 1 rear left

0 3 front right