DFSMShsm: Accommodate the changed default of PDA trace during DFSMShsm startup

Description: Before z/OS V1R13, PDA trace was disabled (PDA=NO) during DFSMShsm startup unless PDA=YES was manually added to the DFSMShsm startup procedure. Starting with z/OS V1R13, PDA trace is enabled (PDA=YES) by default during DFSMShsm startup. After DFSMShsm is started, the SETSYS PDA setting controls PDA tracing.

Element or feature:

DFSMShsm.

When change was introduced:

z/OS V1R13.

Applies to migration from:

z/OS V1R12.

Timing:

Before the first IPL of z/OS V2R1.

Is the migration action required?

Yes, if you do not want the new default.

Target system hardware requirements:

None.

Target system software requirements:

None.

Other system (coexistence or fallback) requirements:

None.

Restrictions:

None.

System impacts:

None.

Related IBM Health Checker for z/OS check:

None.

Steps to take: To enable PDA trace during DFSMShsm startup, no action is required. To disable PDA trace during DFSMShsm startup, specify PDA=NO in the DFSMShsm startup procedure before starting DFSMShsm.

Note: When you do not allocate the ARCPDOX and ARCPDOY data sets in the DFSMShsm start procedure, you receive the following message during initialization unless PDA=NO is explicitly specified.

ARC0036E I/O [INHIBITED | DISABLED] FOR DFSMSHSM PROBLEM DETERMINATION 
  OUTPUT DATA SET, REAS=reason-code

Even in this situation, HSM continues to initialize and operate.

Reference information: For more information about enabling or disabling PDA trace during DFSMShsm startup, see z/OS DFSMShsm Implementation and Customization Guide.