Hi Paul,
The buzzword you are hinting at is called "Toleration Maintenance".

Regards,
David

On 2019-08-30 12:39, Feller, Paul wrote:
> Sorry if my wording was off a little.  But yes the idea is to apply any z/OS 
> 2.1 fixes needed related to support of z/OS 2.3.  That would get you nearer 
> to a system that might allow for fall back from z/OS 2.4.  I'm sure IBM would 
> suggest a two step approach.  Install z/OS 2.3 as soon as possible and then 
> go to z/OS 2.4 later.
>
> Thanks..
>
> Paul Feller
> AGT Mainframe Technical Support
>
>
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On 
> Behalf Of Pommier, Rex
> Sent: Friday, August 30, 2019 10:42 AM
> To: [email protected]
> Subject: Re: z/OS 2.1 to 2.4 [EXTERNAL]
>
> Tom,
>
> The idea is to apply 2.1 maintenance that would make 2.1 compatible with 2.3. 
>  Since IBM won't release 2.4 compatibility maintenance for 2.1, if there's 
> some that would make 2.1 co-exist with 2.3, that might make it easier for the 
> OP to make the jump from 2.1 to 2.4.
>
> Rex
>
> -----Original Message-----
> From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
> Tom Marchant
> Sent: Friday, August 30, 2019 10:31 AM
> To: [email protected]
> Subject: Re: z/OS 2.1 to 2.4 [EXTERNAL]
>
> On Fri, 30 Aug 2019 10:48:03 +0000, Feller, Paul wrote:
>
> Would it be a good thing to at least try to get any z/OS 2.3 compatibility 
> maintenance applied?
>
> What does that mean to someone who is running z/OS 2.1?
> You can't apply a z/OS 2.3 PTF to a z/OS 2.1 system.
>
> --
> Tom Marchant
>
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