Possibly fundamental difference between JES (simulating unit record) and DASD 
(probably blocked).  

Sent from my iPhone

> On Jun 29, 2016, at 13:30, Michael Knigge <michael.kni...@gmx.de> wrote:
> 
> All,
> 
> 
> I have a multithreaded Java application that writes to stdout (and stderr) 
> thru a native C library using fputc and fwrite. Now, at our site everything 
> is all right with output to stderr and stdout from multiple threads.
> 
> 
> At a customer site only output from the main thread is written to the "file" 
> if the DD STDOUT (or STDERR) points to a MVS Data Set. All output from the 
> other threads is discarded.
> 
> 
> If the DD points to SYSOUT=* (instead of a MVS Data Set) the output from the 
> threads is written to the "file" as expected....
> 
> 
> Does anyone have an idea why? LE370 settings are equal to the settings at our 
> site...  Maybe a special SMS Setting?? I have no idea (and no access to the 
> customer site)....
> 
> 
> Thank you,
> 
> Michael
> 
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