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From mainframe DFSMShsm to cloud storage classes: a practical history of HSM, ILM, tiering, recall, and the products that shaped modern archives.
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Hierarchical Storage Management (HSM) is the storage world’s oldest magic trick. It makes expensive storage look bigger by quietly moving data to cheaper tiers. HSM has five moving parts: a primary tier, secondary tiers, a policy engine, a recall mechanism, and a migration engine.