In this Technote we introduce the Restartable Address Space enhancement to PDSE in z/OS V1R6 DFSMS.

With the introduction of the SMSPDSE address space, the majority of PDSE processing was moved into its own address space.  With a continued focus on high availability and outage elimination, the PDSE component of z/OS V1R6 DFSMS will deliver a new restartable PDSE address space to be named SMSPDSE1.

In a z/OS V1R6 or later system you have either the single SMSPDSE address space, or both SMSPDSE and SMSPDSE1 address spaces. The non-restartable SMSPDSE will be the only PDSE address space in the following circumstances:

The new SMSPDSE1 address space will be restartable. It will provide connections to, and process requests for, those PDSE data sets that are not part of the global connections associated with SMSPDSE. In a SYSPLEX coupled systems environment, specify PDSESHARING(EXTENDED), and also specify PDSE_RESTARTABLE_AS(YES) in their IGDSMSxx parameters; then SMSPDSE1 will be created during IPL NIP processing.

Figure 1 shows the PDSE address space at z/OS V1R6 DFSMS level.

By being restartable, an IPL will no longer be required to restart PDSE processing after a critical error. This enhancement will include new commands to affect termination, activation, and restart. The previous ANALYSIS and FREELATCH commands remain, but they can also be used against the new address space when active.

To install and use the new enhancements provided by the design enhancement you need to:

Apply SMPE coexistence and toleration ptfs.