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UIE/VM measurement intervals

An interval is a period of time that specifies which data is to be processed. In UIE/VM, you specify a single processing interval that targets the data collected within a continuous period of time. Within this single processing interval, there can be many modeling intervals, which represent data within the processing interval that is aggregated for analysis into a single modeling interval point.

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Using

Processing interval

The processing interval is a contiguous interval of time, defined by a start time and an end time. A processing interval could be as follows:

Information
Example
STIME 1000
ETIME 2300

This example covers a period from 10 A.M. to 11 P.M. The time period for all processing intervals is continuous, including all hours between the start and stop times. You cannot skip hours within an interval.

The following defaults apply to processing interval commands:

STIME 0000
ETIME 2400

If you specify no start time or end time, the processing interval covers the entire 24 hour day.

We recommend that you specify time by synchronizing with a wall clock rather than with a VM Monitor interval. For example, if VM Monitor intervals are synchronized at 0014, 0029, 0044, and 0059, you should use STIME 0000 rather than STIME 0014. UIE/VM automatically performs all the necessary adjustments. If your VM Monitor file contains multiple days worth of data, UIE/VM can process only the first day of that data. UIE/VM cannot process data after midnight.

UIE/VM uses the processing interval to determine which VM Monitor data records should be processed (those completely or partially within the interval) and which ones should be ignored (those completely outside of the interval).

Warning

Important

Some VM Monitor data records might partially overlap the specified interval, that is, some of their contents could have been collected beyond the time limits indicated. These records are included and processed. The value in these records are normalized according to the length of the intersection of the VM Monitor data record interval and the modeling interval.

Modeling interval

The modeling interval is a contiguous interval for which performance measurements are aggregated and a single baseline model is created. You define the modeling interval by its duration, which you can specify in minutes using the DURN command on the Commands panel. If you choose to use the default duration, it is 60 minutes (one hour). 

BMC Software recommends that you use DURN values, which are either factors of 60 or multiples of 60.

For example, you can specify a DURN value of 5, 6, 10, 15, 20, 30, or 120 minutes, but BMC Software recommends that you do not use 14 or 22. BMC Software recommends that you use the default value of 60 minutes for the DURN command.

If you use zMAP  history files as an input data source, you should set the DURN value to the same interval length value that you specified for your zMAP history files. For example, if your zMAP history files are summarized into 15 minute intervals, you should specify DURN 15 to UIE/VM.



 

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