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What is space management? z/OS DFSMShsm Managing Your Own Data SC23-6870-00 |
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Space management is a process that ensures that there is enough storage space on user volumes for your data. Space management performs two functions that are visible to you:
You can recognize that a data set has been migrated by the term MIGRAT in the volume field when you list your cataloged data sets. Only cataloged data sets can be migrated. The amount of time that a data set remains unused before it can migrate automatically is the same for all data sets on a volume when they are non-SMS-managed. For SMS-managed data sets, the management class determines when the data sets are eligible to automatically migrate. Your computing center can tell you what these values are. Migration occurs to either of two levels: migration level 1 or migration level 2. Migration level 1 (ML1) volumes are always DASD. Migration level 2 (ML2) volumes can be either DASD or tape. Your computing center controls which volumes are to be used as migration volumes. DFSMShsm creates
available space on user volumes by:
DFSMShsm records the location of each data set that it moves in a control data set. |
Copyright IBM Corporation 1990, 2014
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