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IEE5011 –Autumn 2013 Memory Systems Solid State Drive with Flash Memory

IEE5011 –Autumn 2013 Memory Systems Solid State Drive with Flash Memory. Wei-Shen, Hsu Department of Electronics Engineering National Chiao Tung University wilson79114@Hotmail.com. Outline. Introduction An Overview of SSD Drive The Architecture of SSD The Benefit of SSD Drive

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IEE5011 –Autumn 2013 Memory Systems Solid State Drive with Flash Memory

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  1. IEE5011 –Autumn 2013Memory SystemsSolid State Drive with Flash Memory Wei-Shen, Hsu Department of Electronics Engineering National Chiao Tung University wilson79114@Hotmail.com

  2. Outline • Introduction • An Overview of SSD Drive • The Architecture of SSD • The Benefit of SSD Drive • Flash Memory Storage Medium • Flash Memory • NAND Memory Operational Functions • NAND Memory Management Operation • Integrated Lifetime Management • Target SSD Architecture • Results • Reference

  3. Introduction Why SSD?

  4. An Overview of SSD Drive (1/3) • SSD • electrically, mechanically, and software compatible • DRAM-Based SSDs • volatile memory • Flash-Based SSDs • non-volatile memory

  5. An Overview of SSD Drive (2/3) • The Architecture of SSD • Array of Flash Memory • Micro-Controller • Memory Bus Data • I/O Interface

  6. An Overview of SSD Drive (3/3) • The benefit of SSD drive • Without Moving Mechanical Components • Platters • Read/Write Head • Spindle Motor • Silent Operation

  7. Flash Memory Storage Medium (1/5) • NOR Flash • Pros: random data accessibility, faster reading capability • Cons: writing and erasing data • NAND Flash • Pros: large storage capacity, storing and erasing data • Cons: random data accessing

  8. Flash Memory Storage Medium (2/5) • NAND Memory • Memory array • I/O buffer • Page • Main storage area • Spare area

  9. Flash Memory Storage Medium (3/5) • NAND Memory Operational Functions • Read : fetch the required data • Write : 1 → 0 • Erase:0 → 1 • Three Phases: setup, busy, and data transfer

  10. Flash Memory Storage Medium (4/5) • Three Access Operations Phases • SetupPhase • determine a targeted page address • Busy Phase • loading the required data into the I/O buffer • Data Transfer Phase • sequentially fetch data

  11. Flash Memory Storage Medium (5/5) • NAND Memory Management Operation • Out-Place Updating • the newest updated data is written to some available free page • Garbage Collection • change the dead pages into free pages • Wear-Levelling • control the block erasing operation to increase the block lifetime

  12. Target SSD Architecture • Lifetime-Enhancement Techniques • Lossless Compression • Data Deduplication • Performance Throttling

  13. Integrated Lifetime Management (1/4) • Integration of Individual Lifetime-Enhancement Schemes • interval-based approach • enable or disable each lifetime-enhancement scheme

  14. Integrated Lifetime Management (2/4) Deduplication

  15. Integrated Lifetime Management (3/4) • Lossless Compression • Compression Chunk

  16. Integrated Lifetime Management (4/4) • Performance Throttling • Delay write operations • determines a throttling delay • regulates the write speed of SSDs

  17. Results Throttling and Integrated that employ performance throttling can guarantee the 5-year SSD lifetime.

  18. Reference A. R.Rahiman and P. Sumari, "Solid State Disk: A New Storage Device for Video Storage Server, " in ITSim 2008 of International Symposium on Information Technology, 2008. Sungjin Lee, Taejin Kim, Ji-Sung Park, and Jihong Kim, "An Integrated Approach for Managing the Lifetime of Flash-Based SSDs," in Design, Automation & Test in Europe Conference & Exhibition (DATE), 2013.  W.G. Aref, I. Kamel, and S. Ghandeharizadeh, "Disk scheduling in video editing systems," IEEE Transactions on Knowledge and Data Engineering, vol. 13, pp. 933-950, 2011. D. Reinsel, J. Janukowicz, and R. Perry, "Replacing HDDs with SSDs: The Business Case for Transition," 2007. F. Chen, T. Luo, and X. Zhang, "CAFTL: A Content-Aware Flash Translation Layer Enhancing the Lifespan of Flash Memory Based Solid State Drives," in Proceedings of the USENIX Conference on File and Storage Technologies, 2011. Y. Park and J.-S. Kim, "Compression Support for Flash Translation Layer," in Proceedings of the International Workshop on Software Support for Portable Storage, 2010. 1.-D. Kang, 1.-S. Kim, C. Park, H. Park, and 1. Lee, "A multi-channel architecture for high-performance NAND flash-based storage system," Journal of Systems Architecture, vol. 53, pp. 644-658, 2007. S. Lee, T. Kim, K. Kim, and J. Kim, "Lifetime Management of Flash-Based SSDs Using Recovery-Aware Dynamic Throttling," in Proceedings of the USENIX Conference on File and Storage Technologies, 2012. http://www.topology.com.tw/report/reportcontent.asp?id=445TFSVQESCS9K2GX86GCV8NA5

  19. Thank you for your attention

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