Description: Before z/OS V1R13, the allocation option of the Data Set Utility (OPT3.2) in Interactive System Productivity Facility (ISPF) opened and closed new non-SMS-managed sequential data sets to write end-of-file (EOF) markers. Beginning in z/OS V1R13, this action is no longer performed for new allocations through OPT3.2 and the new AL line command of the Data Set List Utility (OPT3.4). As a result, the referenced date is not set and is displayed with a value of ***None*** on the ISPF Data Set Information panel and in the Referred column of the ISPF Data Set list panel. This behavior is now consistent whether the data set is SMS-managed or not.
| Element or feature: | ISPF. |
| When change was introduced: | z/OS V1R13 |
| Applies to migration from: | z/OS V1R12 |
| Timing: | After the first IPL of z/OS V2R1. |
| Is the migration action required? | Yes, if users expect to have the reference date set when allocating a new non-SMS managed sequential data set using ISPF option 3.2 or the AL line command of ISPF option 3.4. |
| 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: Notify users that the referred date for a non-SMS-managed sequential data set is not set when the data set is allocated using the ISPF Data Set Utility (option 3.2) or the ISPF Data Set List Utility (option 3.4) AL line command.
Reference information: For a description of ISPF panel changes, see z/OS ISPF User's Guide Vol II.