IBM Mainframe Forum

Hello, with DFSMS, we can't choose ourself a volser when we create a dataset.
I'm looking for an option to force the volser even if the VOLSER is in a storage groupe.
Is it somethng we can do ?

Yes, allocate on a volume that is NOT in a storage group. By attempting to allocate to a specific volume, you are subverting the entire concept of SMS -- System Managed Storage means that the system, not you, manages where data sets are allocated. So if you want to allocate to a specific volume, you could remove that volume from the storage group (if you have sufficient authority at your site), or you can allocate to a volume not in a storage group. But if you want to allocate to a specific volume in a storage group, you're going to be frustrated.

Hello Robert Sample and Thank's for your answer.
So before, i will remove the voulme of the storage group and after the allocation of the dataset, i will reconnecte the volume in the Storage Group.

But if you want to allocate to a specific volume in a storage group, you're going to be frustrated.

I beg to disagree...

the GUARANTEED SPACE ATTRIBUTE lets the user choose a specific volume for allocation on SMS managed volumes
https://www.ibm.com/support/knowledgece ... guarat.htm

but ... look CAREFULLY at the sections of the manual dealing with the why the approach is discouraged
especially when dfhsm is involved
https://www.ibm.com/support/knowledgece ... bugsds.htm

Thank you enrico-sorichetti.
It's good to know that

You still have to watch out. SMS may grab the allocation from you unless you have an escape coded. STORCLAS=NOSMS may work.

With :



it dosen't work, i have this error message:

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going down the road of useless speculations