Allocating and cataloging IMS system resources

When installing an IMS DB/DC environment, you must allocate and catalog IMS system libraries and online data sets.

Although this activity is done independently of the actual system definition processing, you need to coordinate this activity with several parts of system definition stage 1 input.

Planning for the definition of IMS data sets requires you to predict the direct access storage to be allocated based on your anticipated application program work load. Some of the data sets you estimate are affected by the design decisions made for system definition. Most of these data sets are automatically generated as DD statements within the members of IMS.PROCLIB.

Note: Certain target and distribution library data sets must be either a PDS or a PDSE. The ADFSJLIB, SDFSJLIB, and ADFSLOAD data sets must be PDSE data sets. SDFSRESL data set must be a PDS. All other target (SDFSxxxx) and distribution (ADFSxxxx) libraries can be either PDS or PDSE.

The External Subsystem Attach Facility (ESAF) supports PDSE load library data sets.

Restriction: IMS supports partitioned data sets extended (PDSEs) for only these libraries: MODBLKS, PGMLIB, SMPLTS, and SDFSJLIB.