RUCSA has to be allocated on a 1M boundary, so take that into consideration 
when looking at your virtual storage map. A RUCSA allocation below the line, if 
you don't also reduce CSA will result in the below the line private being 
reduced by 1M. Extended private isn't usually much of a concern.

Mark Jacobs

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, March 12, 2020 12:11 PM, Jousma, David 
<[email protected]> wrote:

> Thanks for clarifying Jim!
>
> Dave Jousma
>
> AVP | Manager, Systems Engineering
>
> Fifth Third Bank | 1830 East Paris Ave, SE | MD RSCB2H | Grand Rapids, MI 
> 49546
>
> 616.653.8429 | fax: 616.653.2717
>
> From: IBM Mainframe Discussion List [email protected] on behalf of Jim 
> Mulder [email protected]
> Sent: Thursday, March 12, 2020 11:38:36 AM
> To: [email protected] [email protected]
> Subject: Re: RUCSA
>
> CAUTION EXTERNAL EMAIL
>
> DO NOT open attachments or click on links from unknown senders or unexpected 
> emails
>
> For releases earlier than z/OS 2.4, RUCSA is provided by APAR OA56180.
>
> R790 PSY UA98722 UP19/03/28 P F903
> R7A0 PSY UA98723 UP19/03/28 P F903
> R7B0 PSY UA98724 UP19/03/28 P F903
>
> publibz.boulder.ibm.com/zoslib/pdf/OA56180.pdf
>
> Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp.
> Poughkeepsie NY
>
> "IBM Mainframe Discussion List" [email protected] wrote on
> 03/12/2020 11:07:04 AM:
>
> > From: "Jousma, David" [email protected]
> > To: [email protected]
> > Date: 03/12/2020 11:34 AM
> > Subject: Re: RUCSA
> > Sent by: "IBM Mainframe Discussion List" [email protected]
>
> > The problem with RUCSA "feature" not being available in prior
> > version (maybe it is, I just don’t see it), is that there is no path
> > to convert into that prior to rolling V2.4. I guess all the
> > prep work could be done (SAF rules, etc) ahead of time, but that
> > would surely be a "must check out". The other problem with RUCSA
> > is that if your offending/affected app requires below-the-line CSA,
> > the minimum amount of RUCSA is 1MB, even if you only needed a few K
> > for whatever you are doing. That will affect below-the-line
> > private for sure.
>
> --
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