124 IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
򐂰 Total I/O requests (requested I/O operations per second)
You may only enable a particular threshold once minimum values for warning and error levels
have been defined. If you attempt to select a threshold and enable it without first modifying
this value, you will see a notification like Figure 4-34.
Figure 4-34 DS8000/DS6000 Threshold enable warning
To modify the warning and error values for a given threshold, you may select the threshold,
and click the Properties button. The panel in Figure 4-35 will be shown. You can modify the
threshold as appropriate, and accept the new values by selecting the OK.
Figure 4-35 Modifying DS8000/DS6000 threshold warning and error values
4.3.5 Exploiting gauges
Gauges are a very useful tool and help in identifying performance bottlenecks. In this section
we will show the drill down capabilities of gauges. The purpose of this section is not to cover
performance analysis in detail for a specific product, but to highlight capabilities of the tool.
You may adopt and use a similar approach for the performance analysis.
Before exploiting gauges, appropriate time frame samples which cover high/low I/O rate
should be collected.
Tip: In TotalStorage Productivity Center for Disk, default thresholds warning and error
values of -1.0 are indicators that there is no recommended minimum value for the
threshold and are therefore entirely user defined. You may elect to provide any reasonable
value for these thresholds, keeping in mind the workload in your environment.
Chapter 4. Planning and monitoring tools 125
Creating gauges
Here, we will describe how to create and customize the gauges for DS6000.
For creating the gauge, launch the Performance gauges panel as shown in Figure 4-36 by
right-clicking on the DS6000 device.
Figure 4-36 Performance gauges panel
Click Create to create a new gauge. You will see a panel similar to Figure 4-37. On the left
pane of this panel, you can choose to create a performance gauge at the Cluster
(server0/server1) level, the Rank Group (Rank) level, or the Volume level.
For example, when we select Cluster level, Total I/O, Reads/second, Writes/second and AVG
response time appear in the metrics box, and a pair clusters appears in the component box.
Figure 4-37 Create performance gauge
Enter the name and the description of the gauge. Select Data points or Date range to show
the historical data collection sampling period and check Display gauge. Upon clicking OK, we
can get the next panel as shown in Figure 4-38 on page 126.
126 IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
Figure 4-38 Gauge for DS6000 Cluster performance
Modify gauge to view Rank level metrics
To modify a performance gauge, select the gauge you want to modify in the Performance
gauges panel and click Properties as shown inFigure 4-36 on page 125. You can select the
"Save As" button to save the modified gauge as a new gauge (under a new name) while
keeping the existing gauge.
Then the subsequent panel is shown in Figure 4-39 on page 127. When selected Rank level
on the left pane, and component for RANK 0 and the metrics for Average response time as
circled on the figure, the resulting gauge is shown in Figure 4-40 on page 127.
Chapter 4. Planning and monitoring tools 127
Figure 4-39 Customizing gauge for array level metric
Figure 4-40 Modified gauge with Avg. response time chart

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