Using DATACLAS in JCL which is CDS but not in ACS

ignich7 · New User Joined: 02 Nov 2005 Posts: 66

Hi..

I have a dataclass named XXX. It is defined using ISMF but not used in ACS. If I code DATACLAS=XXX in my JCL for dataset allocation, my dataset does not get XXX instead it gets default DATACLAS.

Is it possible to use a DATACLAS which is defined in ACDS and not used in ACS? Please let me know.

Thanks in advance,
Gnana Nicholas

enrico-sorichetti · Posted: Wed Oct 24, 2012 8:31 pm

it depends on how the ACS routines are written
and the standards

since JCL passes to the ACS routines the SMS tokens as specified

normally for THE DATACLAS
the ACS routine checks that the DATACLAS token is NOT NULL
and simply exits returning the passed value asis without any checking

while it might be harmless to do so for the dataclass
, at most you get a dataset defined with the wrong characteristics ,
and easy to find out at the first program execution

might not be the same for the storage and management stuff
where an error might be discovered much later

Pete Wilson · Posted: Mon Nov 05, 2012 9:21 pm

It is not possible to use a Dataclas defined in the ACDS if the ACS code does not assign it.

In most companies the ACS code will check it is a valid Dataclas and just accept the one you have coded in the JCL.

However they may also have code that will check the Dataclas you've coded and then also check some other variables like USERID and dataset name for example and decide you can't use that particular Dataclas. They may just assign another such as a DEFAULT one or just exit and abend the allocation.

These decisions are entirely dependent on your particular companies ACS code policy, so you have to ask your Storage people what applies.