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Chapter 1 Overview of Performance Monitoring Function
Maximum/minimum
External I/O Density
Maximum/minimum
External Transfer Rate
Maximum/minimum
External Busy Rate
Maximum/minimum
Internal I/O Density
Maximum/minimum
Internal Transfer Rate
Maximum/minimum
Internal Busy Ratio
(3) Inserting configuration information
In addition to the statistics information summarized in the method described in previous sections, configuration
information is also stored in the summarized statistic information file. This feature allows easy identification of the
various types of statistic information.
(4) Types of summarized files
In order to select an appropriate balance between the time resolution and amount of accumulated information. You
can create summarized files whose average time interval in the period of summarizing is one hour and summarized
files whose average time interval is one day.
A file which contains statistic information summarized in units of hours is called a primary summarized file, and file
which contains statistic information summarized in units of days is called a secondary summarized file. In other
words, iSM has three types of files which store statistic information, as shown in Table 1-5.
Statistic Information History File
Statistic Information Primary
Summarized File
Statistic Information Secondary
Summarized File
(5) Types of summarizing operations
iSM provides the following three types of summarizing functions to deal with the two types of summarized files.
This is the maximum and minimum values of the external I/O Density in each
measurement period contained in the period of summarizing. The unit is
count/1000 seconds.
This is the maximum and minimum values of the external transfer rates in each
measurement period contained in the period of summarizing. The unit is
kilobyte/second.
This is the maximum and minimum values of the external busy ratios in each
measurement period contained in the period of summarizing. The unit is %
(percent).
This is the maximum and minimum values of the internal I/O density in each
measurement period contained in the period of summarizing. The unit is
count/1000 seconds.
This is the maximum and minimum values of the internal transfer rates in each
measurement period contained in the period of summarizing. The unit is
kilobyte/second.
This is the maximum and minimum values of the internal busy ratios in each
measurement period contained in the period of summarizing. The unit is %
(percent).
Table 1-5 Types of Files in Which Statistic Information Is Stored
Type of File
Logging Interval
One hour
One day
Average Time Interval of
Period of Summarizing
I-22
Amount Recorded in One File
For max. of one day
For max. of one day
For max. of one month
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