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

Planning Superdome Conﬁgurations

Building Blocks and Deﬁnitions

Appendix A 319

Conﬁguring and Controlling an I/O Chassis

Before a chassis is installed in its I/O bay and cabled to a cell, you will

not be able to power it on. Once the chassis is cabled to a cell, powering

on the cell will power on the chassis and powering off the cell will power

off the chassis. Powering off a chassis that is attached to an active cell

requires some planning.

Powering Off an I/O Chassis

You can power off an I/O chassis only if it is inactive. If the chassis is

cabled to a cell, and the cell is active in a partition (that is, the partition

has booted and the cell has booted as part of the partition) then the

chassis is active.

This means that in order to power off a chassis (to do maintenance or

replace it, for example) you need to shut down the partition and do one of

the following:

• While the partitionis down,use the GSP command menu topower off

the chassis (a good approach if you need to replace the chassis and a

spare is on hand - once the spare has been installed you can boot the

partition).

• Disconnect the chassis from the cell, boot the partition, then go to the

GSP command menu to power off the chassis (appropriate if the

partition has to be back online as fast as possible and whatever needs

to be done to the chassis might take some time).

• While the partition is down, from another partition set the “use on

next boot” ﬂag off for the cell attached to the chassis, then boot the

partition; then you can power off the cell and chassis because the cell

is not active.