NPM Session Collector Function

NPM Session Collector Function gathers response time and loads data at its VTAM interface. Once there, NPM intercepts the VTAM buffer trace module and saves information from the buffer trace in CSA until the session collection interval expires. At this point, the data in CSA is assembled and recorded. The NPM Session Collector Function records response time and loads data to the NPM SMF type 28 record, and to the Session Statistics File, which is a key-sequenced VSAM file. NPM session data can be input to
MICS
network only in SMF format.
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NPM Session Collector Function gathers response time and loads data at its VTAM interface. Once there, NPM intercepts the VTAM buffer trace module and saves information from the buffer trace in CSA until the session collection interval expires. At this point, the data in CSA is assembled and recorded. The NPM Session Collector Function records response time and loads data to the NPM SMF type 28 record, and to the Session Statistics File, which is a key-sequenced VSAM file. NPM session data can be input to
MICS
network only in SMF format.
For VM, NPM Session Collector Function records response time and loads data in SMF type 28, subtype '20'X. It is also your responsibility to transport the VM SMF-equivalent type 28 records to your
MICS
MVS host. No special preparation is required.
Controlling the Volume of Data
The NPM Session Collector Function initiates a VTAM buffer trace for each resource that is requested by the Session Collection command. As a result, CSA storage and direct-access storage space that is needed to contain this data for all logical units (LUs) on a medium-to-large network is prohibitive. Therefore, NPM provides the data center with the ability to record data for selected network components only. You can use both the SESSCOLL command, which is invoked at NPM initialization, and the Start Session Collection screen to limit the data to specific LUs. You can also decide to specify all LUs that are associated with specific nodes (including local NCPs, cross-domain NCPs, local hosts, and cross-domain hosts), applications, or virtual routes.
Network Response Time and Definite Response
NPM network response time (transit time in NPM terms) is an approximation of the time each transaction spends in the network. It is only measured by the NPM session collection function for transactions that specify definite response (DR).
It is your responsibility to activate DR for any transactions that require network response time.