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플래시 메모리 시스템을 위한 신뢰성 있는 RAID 기법
- Alternative Title
- A Reliable RAID Technique for Flash Memory System
- Author(s)
- Koo Sohyun
- Alternative Author(s)
- Sohyun Koo
- Advisor
- 정태선
- Department
- 일반대학원 컴퓨터공학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2016-02
- Language
- eng
- Alternative Abstract
- Flash memory features low power consumption, light weight, and fast speed. Because of its characteristics, flash memory is widely used in various devices for consumers, such as a smart phone, a smart pad, a digital camera, a desktop, and a large scale data center, etc. However, flash memory has a limit of write/erase times problem and high error rate problem. These problems cause low reliability of SSD. To increase its reliability, traditionally error correction codes (ECCs) are used. The Redundancy Array of Inexpensive Disk (RAID) is widely used to enhance both reliability and performance of SSD by redundant data across multiple disks. When the RAID technique is used in SSD, update operations in the parity disk occur more frequent than other disks. To solve this problem, I propose the new RAID technique for SSD. The proposedFlash memory features low power consumption, light weight, and fast speed. Because of its characteristics, flash memory is widely used in various devices for consumers, such as a smart phone, a smart pad, a digital camera, a desktop, and a large scale data center, etc. However, flash memory has a limit of write/erase times problem and high error rate problem. These problems cause low reliability of SSD. To increase its reliability, traditionally error correction codes (ECCs) are used. The Redundancy Array of Inexpensive Disk (RAID) is widely used to enhance both reliability and performance of SSD by redundant data across multiple disks. When the RAID technique is used in SSD, update operations in the parity disk occur more frequent than other disks. To solve this problem, I propose the new RAID technique for SSD. The proposed RAID technique uses the uneven parity distribution without any disk replacement. The reliability of the proposed RAID technique is also analyzed with discrete time markov chain. Consequently, the proposed SSD RAID scheme improves reliability. RAID technique uses the uneven parity distribution without any disk replacement. The reliability of the proposed RAID technique is also analyzed with discrete time markov chain. Consequently, the proposed SSD RAID scheme improves reliability.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Computer Engineering > 3. Theses(Master)
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