IBM PERFORMANCE MANAGEMENT FOR POWER SYSTEMS - INTERACTIVE GRAPHING SUPPORT FOR I Manual page 13

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Peak Disk Arm Utilization in % - with Trend Projections
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Peak Disk Arm Utilization in % (3 Month Trend)
This graph shows the average peak disk arm utilization for up to 13 months, and a three-month trend projection
for the two busiest hours per measured day during the period. The trend projects the disk arm utilization for the
next three months based on the last 3, 6 and 12 months growth history. The trend months are the three last
months shown.
Because each displayed value is an average, the actual values during each month can be higher or lower than
what is indicated on the graph.
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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