Answer:
Tiered storage is the assignment of different categories of data to different types of storage media. Categories may be based on protection levels, performance requirements, frequency of use, cost of storage media or other business considerations.
Because assigning data to particular media may be an ongoing and complex activity, some vendors provide software for automatically managing the process using company-defined policies. For example, a data storage administrator might assign infrequently used data to slower, less-expensive SATA storage but allow the data to be automatically moved to higher-performing SAS or solid-state drives (SSDs) as it becomes more active.
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