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The truth is, the absolute amount of hot data remains relatively constant when a business is running at steady state. But cooler data continues to accumulate. So, the proportion of cold over hot shifts over time.
This implies that your capacity growth will be more pronounced on secondary storage.
And although traditional storage tiering seems like a way to break the cycle, is it the best you can do?
This data sheet covers auto-tiering capabilities of DataCore SDS and explains the benefits this brings to data placement and can be yours after a quick survey.