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Coordinating storage components across abstraction layers has demonstrated significant performance gains. However, when applied near the physical storage, this approach relies on exposing and exploiting low-level hardware characteristics, perhaps a large number of them, to cope with complex modern disks and RAIDs. Through implementation and validation of prior research on track-aligned accesses and its incorporation in RAIDs, as well as through experimentation with our proposed queue coordination in RAIDs, we confirmed that cross-layer coordination can indeed yield high performance gains. On the other hand, the effective use of cross-layer coordination involves overcoming several challenges: (1) developing efficient and automated ways to extract and exploit hardware characteristics due to rapidly evolving disks, (2) fostering a greater understanding of the legacy storage data path, so that we can better predict the benefits of low-level optimizations and their intertwined interactions, and (3) inventing efficient and automated ways to tune the low-level parameters.
A Thesis Submitted to the Department of Computer Science in Partial Fulfillment of the Requirements for the Degree of Master of Science.
Includes bibliographical references.
Andy Wang, Professor Directing Thesis; Theodore P. Baker, Committee Member; Xin Yuan, Committee Member.
Florida State University
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