Peak Disk Arm Utilization In % - With Trend Projections - IBM PERFORMANCE MANAGEMENT FOR POWER SYSTEMS - GRAPH REFERENCE DOCUMENT 10-2010 Reference

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Peak Disk Arm Utilization in % - with Trend Projections

Monthly Peak Disk Arm Utilization and Trending Graph.
The Peak Disk Arm Utilization in %, with Trend Projections graph shows the average disk arm
utilization, in percent, of the two busiest hours per day. Because it is an average, values for
shorter periods can exceed or be lower than what is indicated on the graph. This graph shows
the average 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 months are the last three
months shown.
The symbols used on this graph are explained as follows:
The forward slash (green) at the bottom shows the level of disk arm utilization that is
considered acceptable.
The crosshatch (yellow) in the middle shows the level of disk arm utilization that is
considered marginal.
The backward slash (red) at the top shows the level of disk arm utilization that is
considered critical.
The black diamond shows the average of the two busiest hours per day during the
month.
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PM for Power Systems Graph Reference Document

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