Huan Li
ABSTRACT
Extending NAND flash to off-the-shelf sensor platforms has great potential for improving in-network processing for sensor networks. However, due to the specific read/write characteristics of NAND, the strict resource constraints of sensor devices, e.g., main memory and energy, and the time-series sensing property of sensor applications, designing an efficient resource-aware flash storage system on sensor platforms is a challenging work. In this paper, we propose Time-Log Tree (TL-Tree), a novel indexing structure that is designed to consider time-series as a primary characteristic for optimizing both memory and energy constraints. TL-Tree is an unbalanced tree tailored to temporal sensor data. It realizes the flash utilization bound problem and builds a cascaded structure wherein only the root tree and the most recently updated subtree are stored in the main memory. We prove that TL-Tree minimizes the memory cost and also maximizes the effective usage of flash capacity. Compared to other schemes, simulation results show that the TL-Tree achieves much better access and energy savings for MicaZ platforms. We developed a hardware board that includes a raw 128MB NAND flash chip on MicaZ mote, and also implemented a flash driver and the TL-Tree to demonstrate the practical use of this idea.
- D. Agrawal, D. Ganesan, R. Sitaraman, Y. Diao, and S. Singh. Lazy-Adaptive tree: An optimized index structure for flash devices. Proceedings of the 35th VLDB, pages 361--372, August 2009. Google Scholar
Digital Library
- ATmel. ATmel AT49f1024 datasheet. http://www.atmel.com, 2001.Google Scholar
- Y.-S. Chu, J.-W. Hsieh, Y.-H. Chang, and T.-W. Kuo. A set-Based mapping strategy for flash-memory reliability enhancement. 12th ACM/IEEE Conference of Design, Automation, and Test in Europe (DATE), pages 405--410, April 2009. Google ScholarDigital Library
- H. Dai, M. Neufeld, and R. Han. ELF: An efficient log-structured flash file system for micro sensor nodes. ACM Conference on Embedded Networked Sensor Systems, pages 176--187, November 2004. Google ScholarDigital Library
- P. Desnoyers, D. Ganesan, and P. Shenoy. TSAR: A two tier storage architecture using interval skip graphs. Proceedings of the Third ACM Conference on Embedded Networked Sensor Systems (SenSys), pages 39--50, 2005. Google ScholarDigital Library
- Y. Diao, D. Ganesan, G. Mathur, and P. Shenoy. Rethinking data management for storagecentric sensor networks. Proceedings of the Third Biennial Conference on Innovative Data Systems Research (CIDR), pages 410--419, January 2007.Google Scholar
- G. Graefe. The five-minute rule twenty years later, and how flash memory changes the rules. Communications of the ACM, 52(7), July 2009. Google ScholarDigital Library
- J. L. Johnson. Database: Models, languages, design. Oxford University Press, 1997. Google ScholarDigital Library
- D. Kang, D. Jung, J.-U. Kang, and J.-S. Kim. μ-Tree: An ordered index structure for nand flash memory. The International Conference on Embedded Software, pages 144--153, September 2007. Google ScholarDigital Library
- P. Levis, S. Madden, J. Polastre, and R. S. et. al. TinyOS: An operating system for wireless sensor networks. Ambient Intelligence, 2005.Google ScholarCross Ref
- S.-H. Lim and K.-H. Park. An efficient nand flash file system for flash memory storage. IEEE Transactions on Ccomputers, 55(7): 1--7, July 2006. Google ScholarDigital Library
- G. Mathur, P. Desnoyers, D. Ganesan, and P. Shenoy. Capsule: An energy-optimized object storage system for memory-constrained sensor devices. Proceedings of SenSys'06, November 2006. Google ScholarDigital Library
- G. Mathur, P. Desnoyers, D. Ganesan, and P. Shenoy. Ultralow power data storage for sensor networks. ACM/IEEE IPSN-SPOTS, April 2006. Google ScholarDigital Library
- S. Nath. Energy efficient sensor data logging with amnesic flash storage. ACM/IEEE IPSN, pages 157--168, 2009. Google ScholarDigital Library
- S. Nath and A. Kansal. FlashDB: Dynamic self-tuning database for nand flash. ACM/IEEE IPSN, pages 410--419, April 2007. Google ScholarDigital Library
- Samsung. M390S2858CT1 datasheet. http://www.samsung.com/global/system.Google Scholar
- R. Tan, G. Xing, J. Chen, W. Song, and R. Huang. Quality-driven volcanic earthquake detection using wireless sensor networks. In Proceedings of The 31st IEEE Real-Time Systems Symposium (RTSS), San Diego, CA, USA, November 30 - December 3 2010. Google ScholarDigital Library
- Aleph One. YAFFS: Yet another flash file system. http://www.yaffs.net, 2001.Google Scholar
- Aleph One. YAFFS2 specification and development nodes. http://www.yaffs.net, 2005.Google Scholar
- Toshiba America Electronic Components, Inc. (TAEC). Toshiba TC58DVG02A1FT00 datasheet. http://www.toshiba.com/taec-Datasheet:TC58DVG02A1FT00, Jun. 2003.Google Scholar
- D. Woodhouse. JFFS: The journalling flash file system. Ottawa Linux Symp, 2001.Google Scholar
- Xbow. MicaZ datasheet. http://www.xbow.com/Products/Product-pdf-fileszGoogle Scholar
- D. Zeinalipour-Yazti, S. Lin, V. Kalogeraki, D. Gunopulos, and W. A. Najjar. MicroHash: An effcient index structure for flash-based sensor devices. USENIX FAST, Dec. 2005. Google ScholarDigital Library
Index Terms
- TL-Tree: flash-optimized storage for time-series sensing data on sensor platforms
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