Data Sets › Recreating Data Sets

Recreating Data Sets

You are allowed to recreate the last data set on a tape volume if you meet the following conditions:

• Specify the same data set name as the one used to originally create the data set.
• Change the JCL disposition parameter to OLD or SHR. If original BLKCNT=0 then DISP=NEW will also be allowed for recreate. If a multivolume data set is being recreated and uses fewer volumes than the original file, CA 1 has an option to either unchain and expire any remaining volumes from an existing chain, or to keep all existing volumes in the chain. This option is called RECRE8 and is documented in the Systems Programmer Guide.

CA 1 assumes that you are aware of these conditions and allows the file to be written over. The TMC expiration date for the data set is changed to match the specifications in the JCL of the recreating step if the JCL expiration date is higher then the expiration date already set in the TMC.

Recreation is never allowed if the tape is one of the following:

• A permanent hold tape (LABEL=EXPDT=99365 or LABEL=EXPDT=99366 or ACCODE=xCAPERM).
• The tape is marked out-of-area to a location other than a special CA 1 out-of-area code.

An exit is provided to disallow recreating data sets based on data set name and job name. Closed loop GDG processing is allowed by disregarding the generation and version number (G0000V00).