Instrumentation levels

The resources in a WebSphere cell are instrumented so that statistical data can be collected. Instrumentation refers to the mechanism by which some aspect of the running system is measured (analogous to a meter attached to a resource). Each resource category has an instrumentation level (different from the impact rating for the counters in that category). The instrumentation level determines which counters are available to be collected for that category and correspond to the level of performance impact a particular grouping of counters will have on the customer environment.

For example, if a resource category has an instrumentation level setting of low, only counters having a low impact rating are available for selection. If the instrumentation level is set to medium, then counters having low and medium impact ratings are available for selection. Similarly, when the instrumentation level is set to high, all counters with low, medium, and high impact ratings are available for selection.

An instrumentation level can also be set to maximum, which enables the availability of all counters and, in addition, increases the level of granularity when reporting on enterprise methods. This setting has a higher impact on a system's performance. Conversely, the instrumentation level can be set to none, which disables performance reporting and eliminates any impact of monitoring on system performance. Initially, the instrumentation levels are set to none.

  Prev | Home | Next

 

WebSphere is a trademark of the IBM Corporation in the United States, other countries, or both.

 

IBM is a trademark of the IBM Corporation in the United States, other countries, or both.