Migrating from an earlier IMS 15 release

Because IMS 15 and the releases within the version, such as IMS 15.1 and IMS 15.2, use a single set of SMP/E function modification identifiers (FMIDs), you do not need to perform a full installation of IMS to migrate from IMS 15.1 to IMS 15.2. Instead, you apply APAR/PTFs to migrate to IMS 15.2 if you are already using IMS 15.1.

You can migrate to IMS 15.2 from IMS 15.1 by applying the PTFs for APAR PH16682 and APAR PH23298 to update the IMS installed level that is displayed in select output. After you apply the PTFs for APAR PH16682 and APAR PH23298, the installed level (that is, the version, release, modification level of the IMS system) is updated from IMS 15.1 to IMS 15.2.

The general steps for migrating to IMS 15.2 from IMS 15.1 are as follows:

  1. Shut down the IMS system.
  2. Apply the PTFs for APAR PH16682 and APAR PH23298.
  3. Restart the IMS system.

    If you are migrating from an IMS 15.1 or earlier system that was the active system in an XRF complex, you must cold start the system after migration.

    If you are migrating from an IMS 15.1 or earlier system that was not the active IMS system in an XRF complex, you do not need cold start the system after migration. You can warm start the system instead.

  4. Perform PTF-level testing.
  5. Check the output of the following messages, commands, and log records to confirm that the IMS version number is updated to IMS 15.2:
    • Messages DFS1929I and DFS4878I.
    • The QUERY IMSFUNC and QUERY IMSPLEX commands.
    • The output page header for DBRC commands.
    • The X'42' and X'4500' log records.

    The IMS installed level is updated to 15.2 in the SCDINLVL control block field. Output locations, including those in the preceding list, that reference the SCDINLVL control block field are updated to 15.2. However, because the IMS installed level that is specified in the SSCDIMSR control block field and the DFSLEV constant is not changed, the output locations that reference SSCDIMSR or DFSLEV will continue to display 15.1 even after you apply PH16682.