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It’s very attractive to ask, “why can’t we store our less frequently used data on lower cost storage?” The HPC market developed several techniques for doing just that, the most common of which is tiered storage.
But this approach has its fair share of data access shortcomings, according to Panasas, which is why they designed Dynamic Data Acceleration (DDA) to overcome them.
Access this paper to view a comparison of tiered storage vs. DDA to see which is most suitable for your HPC storage needs.