An efficient management scheme for updating redundant information in flash-based storage system
- Authors
- Lee, Yangsup; Jung, Sanghyuk; Choi, Min; Song, Yong Ho
- Issue Date
- Dec-2010
- Publisher
- SPRINGER
- Keywords
- Storage systems; Flash memory; Flash translation layer; RAID
- Citation
- DESIGN AUTOMATION FOR EMBEDDED SYSTEMS, v.14, no.4, pp.389 - 413
- Indexed
- SCIE
SCOPUS
- Journal Title
- DESIGN AUTOMATION FOR EMBEDDED SYSTEMS
- Volume
- 14
- Number
- 4
- Start Page
- 389
- End Page
- 413
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/173415
- DOI
- 10.1007/s10617-010-9067-x
- ISSN
- 0929-5585
- Abstract
- Since flash memory has many attractive characteristics such as high performance, non-volatility, low power consumption and shock resistance, it has been widely used as a storage media in embedded and computer system environments. However, there are many shortcomings in flash memory such as potentially high I/O latency due to erase-before-write and poor durability due to limited erase cycles. To address these performance and reliability anomalies, many large-scale storage systems use redundancy-based parallel access schemes such as RAID techniques. However, such redundancy-based schemes incur high overhead due to generating and storing redundancy information, especially in flash-based storage systems. In this paper, we propose a novel and performance-effective approach using a redundancy-based data management scheme in flash storage, called Flash-aware Redundancy Array. The proposed technique not only reduces the redundancy management overhead by performing redundancy update operations during idle periods, but also provides a preventive mechanism to recover data from unexpected read errors occurring before such redundancy update operations finish. From the experiments, we found that the proposed technique improves flash-based storage systems by 19% in average execution time as compared to other redundancy-based approaches.
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