Since you are not accessing the datasets, why would you care what volume they 
are on.  MERGECAT moves catalog entries from one catalog to another.  If any of 
the entries being moved require the VVDS be updated, the information to access 
that VVDS is already available and there is no need for the user to provide it.

> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On
> Behalf Of John Dawes
> Sent: Tuesday, September 26, 2017 9:08 AM
> To: [email protected]
> Subject: Re: MERGECAT QUESTION
> 
> Jesse,
> 
> I noticed that in your example you do not have the DD1 statements which 
> indicate on
> which disks the dsns exist.
> 
> Is it no longer required?  I remember that in the past I had to code in the 
> jcl several DD1
> statements when I was doing a REPRO MERGECAT.
> 
> Could you or somebody confirm?  I ran test using your example and it worked.  
> Just want
> to be sure.
> 
> Sorry to sound like a doubting Thomas.  Catalog maintenance makes me nervous.

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