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3:20-5:45 PM
FTEC-202-1: 3-D Flash (Flash Technology Track)
Paper Title: Modeling and Mitigating Early Retention Loss and Process Variation in 3D Flash

Paper Abstract: We perform a comprehensive experimental characterization of error sources in real 3D NAND flash memory chips, develop predictive models of these error sources, and develop mechanisms that mitigate early retention loss and process variation. Through our experimental characterization, we find that 3D NAND flash memory exhibits three new error sources that were not previously observed in planar NAND flash memory: layer-to-layer process variation, early retention loss, and retention interference. Based on our experimental results, we develop new analytical models of these error sources in 3D flash. Using our new findings and models, we develop four new techniques to mitigate process variation and early retention loss in 3D NAND flash memory. These four techniques are complementary, and can be combined together to significantly improve flash memory reliability. Compared to a state-of-the-art baseline, our techniques, when combined, improve flash memory lifetime by 1.85x. Alternatively, if a vendor wants to keep the lifetime of the 3D flash device constant, our techniques reduce the storage overhead required to hold error correction information by 78.9%.

Paper Author: Sauguta Ghose, Special Faculty Systems Scientist, Carnegie Mellon University
Onur Mutlu, Professor, ETH Zurich and Carnegie Mellon University

Author Bio:

Author 2 Bio: Onur Mutlu is a Professor of Computer Science at ETH Zurich. He is also a faculty member at Carnegie Mellon University, where he previously held the William D. and Nancy W. Strecker Early Career Professorship. He received dual B.S. degrees from the University of Michigan in 2000, and an M.S. degree in 2002 and a Ph.D. degree in 2006 from the University of Texas at Austin. Dr. Mutlu's industrial experience includes starting the Computer Architecture Group at Microsoft Research, where he worked from 2006 to 2009, and various product and research positions at Intel Corporation, Advanced Micro Devices, VMware, and Google. He received the inaugural IEEE Computer Society Young Computer Architect Award, the inaugural Intel Early Career Faculty Award, faculty partnership awards from various companies, and a healthy number of best paper and "Top Pick" paper recognitions at various computer systems and architecture venues. He is an ACM Fellow, IEEE Fellow, and an elected member of the Academy of Europe (Academia Europaea). His current broader research interests are in computer architecture, systems, and bioinformatics. He is especially interested in interactions across domains and between applications, system software, compilers, and microarchitecture, with a major current focus on memory and storage systems.