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Using composite parameters
The PATROL Knowledge Module for UNIX and Linux provides the ability to create an aggregate parameter. This aggregate parameter consists of two or more existing parameters. BMC PATROL evaluates the values of these designated parameters and then determines, based on user-defined criteria, whether the cumulative effect of these parameters' states warrants a warning or an alarm.
Composite parameters give you the ability to create parameters whose values are dependent on one or more existing PATROL parameters. You can then use PATROL alarm settings and recovery actions on the newly created parameters in the same way that you use alarm settings and recovery actions on other parameters. For example, you can create a composite parameter that triggers an alarm when paging activity is high while processor utilization is low.
A composite parameter consists of a user-defined Boolean expression and a result.
- The Boolean expression can consist of
- existing PATROL parameters
- constant values
- relationship operators, < (less than), > (greater than), == (equal to)
- Boolean operators, && (and), || (or), ! (not))
- string operators
For more information about the relationship operators and the Boolean operators, see the PSL Reference Manual.
The result is a PATROL parameter condition, such as alarm when true, or warn when false. For example, you can build a composite parameter that triggers a PATROL alarm indicating a low memory condition when both of the following conditions are true:
- MEMmemPagesPerSec is greater than 10
- MEMmemPageFaultsPerSec is greater than MEMmemCacheFaultsPerSec.
See Examples for more information.
Related topics
Working-with-Composite-Parameter-Expressions
Examples-of-COMPOSITES-parameter-expressions