Why and when to perform this task
When using SMP/E, there are additional actions
you need to perform in order to apply a new service level or restore to the
previous accepted service level. These new WebSphere Application Server for
z/OS add-ons, which you perform on the WebSphere run-time home directory that
is created in the HFS by the Customization Dialog, were put into place to
reduce some of the post-install service actions you previously had to perform
by hand. It also makes possible tasks you couldn't perform before, such as
updating customized files (such as setupCmdLine.sh or server.xml, which contain
unique content for each node) that exist in each WebSphere run-time home directory,
or seeing new files appear in the WebSphere run-time home directory after
you add them to the SMP/E home directory.
The post installer:
Note: You may find it useful to set up a WLM rule to combat performance problems related to post-install. See Workload management (WLM) tuning tips for z/OS for more information.