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-installation
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-installation service for you.