A Configurable Reliability Framework for Flash-Memory Based Storage Systems
| Autor: | Ming-xian Liu, 劉明峴 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Since MLC flash memory is superior to SLC flash memory in terms of cost and density, most solid-state drives (SSDs) use MLC flash memory as major storage medium. Unfortunately, MLC flash memory has relatively poor reliability and slow access. One feasible solution is to adopt the notion of RAID to construct a large-scale flash memory storage system with high reliability and high performance. However, parity data introduced by RAID structure incur extra writes and updates that could further deteriorate performance and space utilization. To reduce repeated updates of parity data incurred by data updates as well as to make data recovery scheme flexible and space efficient, we propose a configurable reliability framework for SSD-based RAID. Under our framework, users can configure different reliability level for their data based on data importance. With different reliability levels, capability of recovery would differ accordingly. Users could also dynamically change the reliability level of their data whenever needed. Different from prior researches, our framework could not only greatly reduce the overhead incurred by parity data but also guarantee the data reliability. Thus, the proposed framework could be applied in flash memory based storage systems. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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