Displaying Performance Metric Thresholds - HP Surestore Disk Array 12h - And FC60 System Administrator Manual

and consequently different recommendations. This occurs because activity is averaged over the entire
analysis period, and periods of lower activity will offset the effects of busier periods.
For the most accurate analysis, select a period of time that represents normal system operation. Avoid any
unusual events such as a rebuild or changes made to array capacity. If you select a time period that includes
an event which may distort the analysis, the utility will alert you and will not provide any recommendations.
To analyze disk array performance:
1. Right-click the disk array from the Detail pane.
2. Click Properties.
3. Click the Performance tab.
4. Position the interval marker over the desired time period in the Performance Events window. If the time
period you want is not displayed, use the horizontal scroll bar to display the desired time.
5. Click Recommend to display the Performance Recommendations window.

Displaying Performance Metric Thresholds

Several of the performance metrics maintained by the disk array can be displayed. These are the same
metrics used by AutoRAID Manager to produce performance recommendations.
The performance metrics may help you understand how your disk array is performing, but you should avoid
making performance-planning decisions based solely on them. AutoRAID Manager uses other metrics not
displayed in this window when performing its analysis. Consequently, AutoRAID Manager can make a
more accurate analysis and arrive at the best recommendations for improving performance.
To display the performance metric thresholds:
1. Right-click the disk array from the Detail menu.
2. Click Properties.
3. Click the Performance tab.
4. Click Thresholds to display the Performance Thresholds window.
Checking the Working Set Metric
A key factor in monitoring and maintaining optimal performance of the disk array is the Working Set
metric. To ensure that disk array performance is maintained, access the performance metrics regularly and
check the Working Set value.
The Working Set performance metric is derived from the Write Working Set parameter. It indicates the
ratio of the Write Working Set size to the amount of RAID 0/1 space available. For a detailed explanation
Using AutoRAID Manager for Windows NT
Analyzing Disk Array Performance
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