Considerations For A - IBM Power Systems 775 Manual

5.4.2 Considerations for A+

The following are considerations for the use of A+:
Power: More resources are available to the customer that consume power. One option is
to power off unused octants until they are needed.
Space: The extra hardware requires more space. The configuration of the customer might
require an additional CEC or extra Frame.
Cooling: For some customer configurations, moe cooling might be required.
Performance: The overall system performance degrades over time with an A+ resources
failing. For more information, see Figure 5-2 on page 307.
5.4.3 A+ resources in a Power 775 Cluster
The following resources in the CEC/Cluster are used for A+:
System planar
Quad Chip Modules (QCMs)
Hub modules with internal optical fibers
Figure 5-1 shows the following aspects of the A+ strategy:
At installation time, all the Fail in Place and workload resources are available.
When resources fail over the time, failed resources are replaced by the resources that are
provided by A+.
Even with multiple failures during the run time of the maintenance contract, the baseline
committed workload resource is met without performing any physical repairs.
Figure 5-1 Depletion Curve
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