Data collection dynamics
When starting and stopping collections, a start/stop collection request can override a previous request so that the overall set of collections can be refined over time. For example, collections may be started for all resources in a major category, then be overridden by stopping collection on an individual resource. In this case, collections are in effect for all resources except the resource that is explicitly stopped.
VTAM® tracks the
following information for each RTP connection, virtual route, destination
subarea, or VTAM Global subcategory:
- Collection enablement (whether VTAM should gather data)
- SMF enablement (whether data should be delivered at SMF intervals)
- Blocked route enablement (whether data should be delivered when the virtual route becomes blocked or unblocked).
- Collection enablement is determined by the most recent request to start or stop data collection of the subcategory.
- SMF enablement is determined by the most recent Start Performance Data Collection CNM RU specifying the subcategory.
- Blocked route enablement does not apply.
- Collection enablement is determined by the most recent request to start or stop data collection which includes the route within its target resource set.
- SMF enablement is determined by the most recent Start Performance Data Collection CNM RU (except those specifying blocked route switching only) which includes the route within its target resource set.
- Blocked route enablement is determined by the most recent Start Performance Data Collection CNM RU (except those specifying SMF switching only) which includes the route within its target resource set.
The information tracked for virtual routes is also tracked
for destination subareas, except when specified on a single virtual
route request. Tracking information is kept so it can be applied to
any virtual route that is defined dynamically under a destination
subarea. For each RTP connection:
- Collection enablement is determined by the most recent request to start or stop data collection which includes the connection within its target resource set.
- SMF enablement is determined by the most recent Start Performance Data Collection CNM RU which includes the connection within its target resource set.
- Path switch enablement is determined by the most recent Start Performance Data Collection CNM RU (except those specifying SMF switching only) which includes the connection within its target resource set.