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Please!
Verify all details or suggestions with the appropriate vendor and / or vendor's manuals.


The following suggestions are only my opinion. Different company environments may have different opinions and / or requirements.


z/OS and OS/390 marketing and service withdrawal dates


When should you upgrade to a new operating system?

z/OS

About every 6 months



What is meant by maintenance?

Usually PTF's. (Program Temporally Fix)



When should you apply maintenance?

System Maintenance

Receive often, apply when needed

Sub-System Maintenance

Receive often, apply when needed

Product Maintenance

Receive often, apply when needed



Accept APARS

As a general rule, Apars are never accepted. Later maintenance will usually supercede the Apar. If the Apar turns out to be bad, then it can be restored, which you can't do if the Apar is accepted.

Eric Bielefeld
(IBM-Main Discussion Group)

I totally agree and I'm sure everybody else does too!



When should you upgrade sub-systems?

CICS

DB2

IMS

NCP



When should you upgrade your ISV products?

Before a z/OS system upgrade



When should you upgrade your User Mods

User Written Products / Exits / MODS - ONLY IF YOU HAVE TO!

Before a z/OS system upgrade

Disclaimer

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