Install coexistence and fallback PTFs
Description
By installing coexistence and fallback PTFs on your pre-z/OS V2R2 systems, you allow the systems to coexist with z/OS V2R2 systems during your migration. Installing coexistence and fallback PTFs also allows for fallback to the previous systems, if necessary. Coexistence and fallback are important because they allow you to migrate systems in a multisystem configuration to z/OS V2R2 using rolling IPLs (one system at a time), allowing for continuous application availability.
Table 1 provides more details about this migration action. Use this information to plan your changes to the system.
| Element or feature: | Multiple. |
|---|---|
| When change was introduced: | General migration action that is not tied to a specific release. |
| Applies to migration from: | z/OS V2R1 and z/OS V1R13. |
| Timing: | Before installing z/OS V2R2. |
| Is the migration action required? | Yes. |
| Target system hardware requirements: | None. |
| Target system software requirements: | None. |
| Other system (coexistence or fallback) requirements: | Install the appropriate PTFs. |
| Restrictions: | None. |
| System impacts: | None. |
| Related IBM® Health Checker for z/OS® check: | None. |
Steps to take
Before you introduce z/OS V2R2 into your environment, install coexistence and fallback PTFs on all pre-z/OS V2R2 systems with which your z/OS V2R2 system will coexist.
Use the SMP/E REPORT MISSINGFIX command with the FIXCAT type of HOLDDATA as follows:
- Obtain and RECEIVE the latest HOLDDATA onto your pre-z/OS V2R2 systems. Use your normal service acquisition portals or download the HOLDDATA directly from http://service.software.ibm.com/holdata/390holddata.html. Select Full from the Download NOW column to receive the FIXCAT HOLDDATA; the other files do not contain FIXCATs.
- Run the SMP/E REPORT MISSINGFIX command on your pre-z/OS V2R2 systems and specify a Fix Category (FIXCAT) value of "IBM.Coexistence.z/OS.V2R2". The report identifies the missing coexistence and fallback PTFs for that system. For more information about the REPORT MISSINGFIX command, see SMP/E for z/OS Commands.
- Periodically, you might want to obtain the latest HOLDDATA and rerun the REPORT MISSINGFIX command to find out whether there are any new coexistence and fallback PTFs.
Reference information
For an explanation of the z/OS coexistence-migration-fallback policy, see the coexistence and fallback topic in z/OS Planning for Installation.