My suggestion here is to raise a case/incident with IBM JES2.

The fact that the message appears when the job ends, but is not viewable while 
active suggests that there might be a “JES-reason” why this is happening and 
their L2/3 may well know what that is.
Failing there being an existing known issue, they will be able to diagnose 
further.

Rob Scott
Rocket Software

From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Mark Jacobs
Sent: 08 April 2021 16:12
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: STC JESYSMSG Quandry

EXTERNAL EMAIL



AFAIK it's transparent to the user. JES2 compresses/decompresses data 
written/read to/from each track group. It's completely optional. The zEDC 
Integrated Accelerator must be available on the system where JES2 is to perform 
SPOOL compression, and ADVANCED_FORMAT=YES needs to be specified in the 
SPOOLDEF configuration statement, or dynamically enabled.

Mark Jacobs

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Thursday, April 8th, 2021 at 10:53 AM, Paul Gilmartin 
<0000000433f07816-dmarc-requ...@listserv.ua.edu<mailto:0000000433f07816-dmarc-requ...@listserv.ua.edu>>
 wrote:

> On 2021-04-08, at 07:01:20, John S. Giltner, Jr. wrote:
>
> > Not sure if it really makes a difference, but I noticed that one of the 
> > SYSOUT classes, A I think, had COMPRESS=YES and the class K had COMPRESS=NO.
>
> Does the SDSF Rexx interface using a dynamically DDNAME uncompress
>
> on-the-fly?
>
> Is it optional?
>
> Does it depend on choice of command?
>
> -- gil
>
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