Overview of IMS Multiple Address Space Support

IMS™ multiple address space (MASS) support allows you to measure an IMS transaction that is eligible to run in multiple MPP regions, either within a single IMS subsystem or within an IMSPlex. You specify the IMS transaction and the IMS subsystem or IMSPlex group name to measure. Application Performance Analyzer determines the MPP regions that are eligible to process the transaction and returns a list of active MPP regions in Panel 4. You select the regions you want to measure. Application Performance Analyzer creates a parent observation for each IMS subsystem and one child observation request for each selected MPP region grouped within the IMS subsystem.

To enter IMS MASS observations:
  1. Start a NEW request.
  2. In Panel 1 – Job Information, enter a dash (-) in the Job name/Pattern field.
  3. In Panel 5 – Subsystems, enter either the IMS subsystem ID or the IMSPlex group name, and the IMS transaction code.
  4. In Panel 4 – Active Jobs, Application Performance Analyzer returns a list of active MPP regions that are eligible to process the transaction. Select the MPP regions you want to measure. The maximum number of regions you are permitted to select is determined during the installation of Application Performance Analyzer.
  5. In Panel 2 – Options, select the IMS+ data extractor.
  6. Complete any other relevant fields for your observation request.
Once the NEW request is complete and submitted, Application Performance Analyzer creates and starts separate observation requests for each MPP region selected for measurement. The observations are displayed in the R02 Observation List as child observations under an IMS parent. You can view the IMS reports for each MPP region individually. When any of the selected MPP regions has not processed the IMS transaction during the measurement interval, the measurement has a status of Ended, with 1 Sample and no IMS reports are generated.

The NEW line command can be entered on any of the child observations or the IMS parent. When the NEW command is entered on a child observation, the new request is considered a single region request with a transaction code specification, and is initialized with the same parameter values as the original request. When the NEW line command is entered on the IMS parent of a single IMS subsystem, the new request is considered an IMS MASS request and is initialized with the same parameter values as the original request for a single IMS subsystem. The Panel 4 Active Jobs list is populated with the eligible MPP regions at the time of the new request and the desired regions must selected from the list.

Parent topic: IMS performance analysis reports