Important:
Procedure
1 |
From the Subsystem Management Window, do one of the following:
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2 |
Select Settings to specify the logical drives and/or controllers to monitor and to specify the polling interval. To change the polling interval, choose a number of seconds in the spin box. Each time the polling interval elapses, the Performance Monitor re-queries the storage subsystem and updates the statistics in the table. |
3 |
Select Start. Result:
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4 |
Select Stop to stop monitoring the storage subsystem. |
How to Save Performance Data to a File
1 |
Select Save As on the Performance Monitor main screen to save the currently displayed performance statistics. Result: The Save Performance Statistics dialog is displayed. |
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2 |
Save the selected events by choosing an appropriate directory and filename. The Save dialog can filter on files with a .perf extension. Therefore, you may want to save the file with a .perf extension using the filename conventions you used for any previous performance monitor statistics files. The .perf extension is the default. |
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3 |
Type the file name of your choice in the File name text box. Example: Name the file feb14A.perf. |
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4 |
Select the file type of your choice in the Files of type text box.
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5 |
Select Save. Result: A file containing the performance statistics, with a .perf extension or another extension you have specified, is saved to the directory. |
The Performance Monitor data provides information about how your storage subsystem is performing. The data is presented in four columns, described in the table below. Use this data to make performance tuning decisions for your storage subsystem.
Column |
Description |
Devices |
The Device column can display the following values:
|
Total I/Os |
The number of total I/Os performed by this device since the Start button was pressed. When this number exceeds 99,999, it is displayed in thousands (K), beginning with 100K until the number reaches 9999K, at which time it is displayed in millions (M). For amounts greater than 9999K but less than 100M, the value is displayed in tenths (for example, 12.3M). |
Read Percentage |
The percentage of total I/Os (previous column) that are read operations for this device. Write percentage can be calculated as 100 minus this value. |
Cache Hit Percentage |
The percentage of reads that are fulfilled by data from the cache rather than requiring an actual read from disk. |
Current KB/second |
The current KB/second, or transfer rate. Current means the number of KB/second since the last time the polling interval elapsed, causing an update to occur, or since the Update button was pressed. |
Maximum KB/second |
The highest value achieved by the current KB/second column for this polling session (since Start was selected.) |
Current IO/second |
The current I/Os per second. Current means the number of I/Os per/second since the last time the polling interval elapsed, causing an update to occur; or, since Update was pressed. |
Maximum IO/second |
The highest value achieved by the current I/Os per/second column for this polling session (since Start was selected.) |
Specifying Performance Monitor Settings