NPM Session Collection Function
The NPM session collection function gathers response time and load data at its VTAM interface. 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 collection function can record response time and load data to the NPM SMF type 28 record (or the VM equivalent), as well as to the Session Statistics File, a key-sequenced VSAM file.
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The NPM session collection function gathers response time and load data at its VTAM interface. 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 collection function can record response time and load data to the NPM SMF type 28 record (or the VM equivalent), as well as to the Session Statistics File, a key-sequenced VSAM file.
The NPM session data can be input to
MICS
only in SMF format or the VM equivalent (type 28 record, subtype '20'X). Modify the DAY056 step of the MICS DAILY
operational job following the instructions in the INPUTRDR and INPUTSNT PARMS Members section to process this data.Controlling the Volume of Data
The NPM session collection 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.
More information is provided in Chapter 9, Operational Considerations.
Network Response Time And Definite Response
NPM's 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 the data center's responsibility to activate DR for any transactions that require network response time.