This article describes those post-install tasks you might need
to complete before using SMP/E to restore to the previous accepted service
level.
If you install service and then find that, for some reason or
another, you need to revert to a previous release, you typically need only
to use SMP/E to restore to the previous accepted service level. However, some
service releases contain defects that are incompatible with previous releases
of WebSphere Application Server for z/OS.
Note: You will know if you are applying
a service level that contains backward-incompatible defects if you receive
message BBOO0286A (WTOR message 286) when the post installer applies the service.
The console will prompt you to accept the backward-incompatible change. If
you decide not to accept the change, you must either use SMP/E to roll back
to the previous level or follow the post-install backout plans described in
Completing post-installation tasks after using SMP/E to apply a new service level.
When
you restore to the previous accepted service release, you need to first "back
off" any post-install actions containing backwards-incompatible defects that
were applied during that service before using SMP/E to restore to the previous
accepted service level. This article describes the steps necessary to run
the
backoutPTF.sh shell script, which is located in your
bin directory (WAS_HOME/bin, where WAS_HOME is the absolute path of the WebSphere
runtime home directory) and which handles the backing out of applied post-install
service for you.