How to Remove or "Back off" a Cumulative or Group PTFs to the Previous Level
This document explains how to remove or back off cume or group PTFs if neccessary.
Resolving the problem
There is not a quick command or process to backing off the cumulative or group PTFs to a previous level. This is due to three main reasons:
1) The PTFs are spread across multiple products
2) Some of the PTFs become supersedes or requisite PTFs to which others are dependent upon.
3) Some of the PTFs become an actual part of the code rather than pointing to alternate code.
If there is a problem that is believed to have been caused by a PTF being installed, it is recommended that you contact your support to move forward with resolving the issue.
In most cases, the problems are found to be with a specific module or PTF. There is usually a superseding or later PTF that will fix the problem. If the problem cannot be narrowed down to the PTF, but at least to a product, then the product can be reinstalled from Install Media or SAVLICPGM backup (Licensed Programs cannot be restored from a full system save).
If it is absolutely necessary to remove an entire cume, then you will need to reinstall the Licensed Internal Code, Operating System, and ALL of the Licensed Programs. Refer to IBM i Systems management Recovering your System for procedures to restore Licensed Internal Code and the Operating System. Licensed program products (LPPs) cannot be individually restored from a full system save.
- If you have a backup of LPPs created with the SAVLICPGM command, use the RSTLICPGM command to restore the Licensed programs. This will restore the PTFs applied at the time the SAVLICPGM was performed.
- If you do not have a backup of LPPs created with the SAVLICPGM command, reinstall the LPPs from install media, and then apply the previous level PTFs.
1. If the Licensed Internal Code, OS/400, or any of the licensed programs are reinstalled from the install media, then the previous level PTFs will need to be reapplied.
2. Slipping only LIC and OS to the previous PTF levels and not reinstalling the LPPs is not recommended and can cause unpredictable results. Specifically, many LPP PTFs have LIC and OS requisite fixes which will be missing and potentially cause issues with LPP functions.
|Operating System||IBM i 7.2|
|Operating System||IBM i 7.1|
|Operating System||IBM i 6.1|
|Operating System||IBM i 7.3|
More support for:
Software version: 6.1.1, 7.1.0, 7.2.0, 7.3
Operating system(s): IBM i
Reference #: N1014960
Modified date: 03 March 2018