Peter wrote:
Hi
Whenever we moved to the higher version of zOS we have applied the
toleration maintenance but never applied fallback.
Fallback is something when we have to move back to the previous version.
So to my understanding if we can Backout all the changes to the previous
level then how does fallback PTF helps ?
What exactly the fallback PTF does interns of Backout ? Can someone please
help me to understand.
Fallback and coexistence PTFs for lower levels of system software
tolerate changes in persisted data made by higher levels of system
sofware. Although you can back out all the software changes, you cannot
as easily back out the persisted changes.
For example, if we change the format of a catalog record, or introduce a
new record type, the lower level of software will not process the
catalog correctly unless you put the fallback/coexistence PTFs on before
using the newer software level.
We highly recommend that you put on the fallback/coexistence service.
Please review the topics about both in z/OS Planning for Installation,
which you can find here:
http://publibz.boulder.ibm.com/epubs/pdf/e0z3b113.pdf
--
John Eells
IBM Poughkeepsie
[email protected]
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