IBM PERFORMANCE MANAGEMENT FOR POWER SYSTEMS - INTERACTIVE GRAPHING SUPPORT FOR I Manual page 12

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Peak Disk Arm Utilization in %, Utilization by Hour
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Peak Disk Arm Utilization in %
This graph displays the average of the two peak hours for disk arm utilization, for each day during the last three
months, or the period you choose. The information under the Facts heading at the bottom of the graph states
the recommended guidelines for marginal and critical peak utilization and the months calculated to reach this
guideline with your percent usage.
Disk Arm Utilization by Hour
The Disk Arm Utilization by Hour graph shows the average disk arm utilization by hour per the last month, or
the month you select. The information under the Facts heading at the bottom of the graph states the
recommended guidelines for marginal and critical peak utilization.
Note for systems with SAN-based storage:
Each server/LPAR's graph for disk arms will reflect utilization of the portion of the SAN which is accessed by
that server/LPAR. In rare cases, multiple servers using storage on the same SAN unit may result in a slight
increase in displayed disk arm utilization.
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