Availability Guide for Change Management

Reducing the Time Required for Planned Outages
Availability Guide for Change Management–125506
6-3
Anticipating and Planning for Change
Providing Adequate Computer Room Resources
Some changes, such as adding new hardware, can require more power and air
conditioning. You can avoid unnecessary downtime by providing adequate physical
space and ensuring that you have enough power and cooling capacity for additional
equipment.
Configuring Your System With Change in Mind
Some changes can be performed online only if you have designed your system
configuration to accommodate them. One example of this kind of change is adding new
processors to your system. To add a new processor without having to take your system
down, the processor must be in the operating system image (OSIMAGE) loaded on your
system.
Another example of configuring your system with change in mind is to select limits that
allow some space for growth. For example, you can avoid shutting down your online
transaction-processing environment to increase the maximum number of objects
controlled by PATHMON by configuring enough objects for anticipated growth.
Section 3, “Making System Software and Hardware Changes Online,” discusses some
techniques you can use to configure your system with change in mind.