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Tiered storage is one of those things that is a means to an end - and not an end in itself. The reason tiered - not just tiered, but effectively and efficiently tiered - storage is becoming more crucial (indeed, a prerequisite for many organizations) is a simple matter of economics. After all, if storage were free, then everything would logically be stored on the fastest devices available. Capacity would be unlimited and cost no issue. Yes, there are some practical issues around connectivity and access, but one gets the point: the only reason one has long sought the nirvana of an effective storage hierarchy is that storage isn't free and consequently, one need to make choices and allocate data to appropriate levels and types (i.e., costs) of storage.
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