Using GDGs and symbolic variables when multitasking

When the GDG base names do not contain adequate symbolic variables to make the GDG names unique, multitasking might cause cataloging difficulties. With

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spaces might be copied concurrently in several task areas and the non-unique GDG name can cause this issue.

Related topic

Using-GDGs-and-symbolic-variables-in-data-set-names

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handles GDG name processing for the disk. However, controlling tape GDG name assignment is more difficult because tapes are not assigned at allocation time. For tapes, when 

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encounters a poorly constructed GDG name, an informational message is issued that indicates a issue might occur.

Example

Example of a poorly constructed GDG name:

DSNAME INVENTRY.GDG(+1)
Example

Example of a well-constructed GDG name:

DSNAME INVENTRY.&DB.&TS.&TYPE&PART.GDG(+1)

You need the &TYPE variable only when you designate more than one output type (LP, LB, RP, or RB) for the COPYDDN and RECOVERYDDN options.

 

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