Is there anything written anywhere concerning using DCB=(MODEL) in JCL (I can't find anything).
We are in the process of asking everyone to remove it because my understanding it is no longer needed. Documentation to pass along would be very helpful.
Joined: 22 Apr 2006 Posts: 6258 Location: Mumbai, India
As Expat has mentioned, they are no longer required if DFsms is installed and tailored correctly. And, also, I've never tried to create a GDG-model ever at my shop.
However for the sake of theory -- long back, before you can create the files that attach to a GDG base, you need to create a model data-set that contains the DCB information for the files. This model data just needs to be a VTOC entry, it does not need to actually use up disk space. It is possible to create a different model dataset for every possible DCB combination, and some sites actually do that, but this needs a lot of effort to maintain. Many sites use a single model dataset, and then override the DCB information to build the correct type of file. To create a model DCB, use a dummy IEFBR14 job like this