HP Surestore Disk Array 12h System Administrator's Guide for HP-UX, MPE, and W - Page 233
Displaying Performance Metric Thresholds, To analyze disk array performance
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Using AutoRAID Manager for Windows NT Analyzing Disk Array Performance 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 233 Windows NT
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