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Average Response Time
This is the average response time of a single input/output request. The unit is ms (millisecond).
Read Hit Ratio
This is a ratio of the number of inputs that hit the cache to the total number of input requests.
Prefetch Hit Ratio
This is a ratio of the number of inputs that hit the cache via the disk array prefetch function to the total number
of inputs that hit the cache.
Write Hit Ratio
This is a ratio of the number of outputs that hit the cache to the total number of output requests.
Write I/O Ratio
This is a ratio of output requests to the total number of input/output requests.
(iii) Display Graph
Clicking the [Display Graph] button will display a graph in a separate book.
When you create a graph and then want to create another graph with different settings, return to the Storage
Performance Report Viewer start screen, change the settings, and then click the [Display Graph] button. A
separate book is created to display the graph.
The following illustrates an example in which a graph is created by specifying the I/O density and Transfer Rate:
Items displayed in a graph will be described below.
disk array name: Displays the name of the disk array.
sampling term:
Displays the collection period of the statistic information shown in a graph.
Ordinate:
Displays the scale of statistic information selected in the Storage Performance Report Viewer start
screen. If two types of statistic information are selected, scales are displayed in both ordinates.
Abscissa:
Displays the time.
Legend:
Displays the name of the statistic information selected on the Storage Performance Report
Viewer start screen.
Chapter 3 Operations of Performance Monitoring Function
Figure 3-28 Example of Creating a Graph
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