HSM

A few tips on how to handle problems with IBM's DFSMSHSM, just called HSM hereafter. HSM is a backup and recovery product, and also a migrate and retrieve product. It works on the concept of a storage hierarchy, where commonly used data is kept on fast access disk, data which has not been referenced for a while is archived off to compressed disk, then eventually to slower access tape. HSM is policy based, it uses DFSMS constructs called management classes to decide, almost on a file by file basis, how long a file is kept at each level in the storage hierarchy, and how often that file gets backed up.

The pagesets are split up into

• The main components of HSM
• Fixing problems with backups or migrated datasets
• Fixing and reporting problems with the HSM task
• HSM Commands
  • Dataset Commands
  • Operator Commands
  • Administration Commands

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