On Thu, 31 May 2012 15:25:04 -0600, Steve Comstock wrote:

>I run a job that creates a new data set using
>this DD statement:
>
>//NEWMAST    DD  DISP=(NEW,CATLG),DSN=&SYSUID..WORK.NEW.ZINPUTA,
>//       LIKE=STNT329.TRAIN.ZINPUTA
>
>Job runs fine and creates the new file.

Is the data set SMS managed?

>Now I run it again; I expect it to fail with 'DUPLICATE
>DATA SET NAME' - but it doesn't. Instead, it goes ahead
>and allocates the file on a storage volume and gives me
>a zero completion code; just doesn't catalog the data
>set.

Storage volume suggests that it is allocated to a non-managed 
volume.  This is not unusual.  Did you receive a NOT CATLGD 2 
message?

-- 
Tom Marchant

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