A data set retention period must be defined to CA TLMS in the Retention Master File (RMF) to preserve tape data sets as long as required, and then reuse the tapes as quickly as possible when the data is no longer needed. You will need to analyze your retention needs and determine retention standards that both protect data and make full use of your tape resources. Generally, you will want to retain all permanent data sets for some minimum period of time. This could be a fixed number of days, or any number of days since the data set was last used. Another standard could allow data sets to remain on tape as long as they are in the z/OS catalog.
In addition to the retention standards you establish for all data sets, you will have critical data sets that need to be moved off site in case of disaster. Various groups of critical data sets may need to be handled in different ways. For example, if different versions of a data set are created by a job that executes regularly, you probably only want to retain the most current version of that data set.
By carefully analyzing your retention requirements and using data set naming standards to group data sets that have similar requirements, you can minimize the number of definitions you must supply to the Retention Master File.
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