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- W2904216795 abstract "Emerging high-density non-volatile random access memories (NVRAMs) can significantly enhance server main memory by providing both higher memory density and fast persistent memory. An unique design requirement for server main memory is strong reliability because uncorrectable errors can cause a system crash or permanent data loss. Traditional dynamic random access memory (DRAM) subsystems have used chipkill-correct to provide this reliability, while storage systems provide similar protection using very long ECC words (VLEWs). This paper presents an efficient chipkill-correct scheme for persistent memory based on high-density NVRAMs. For efficiency, the scheme decouples error correction at boot time from error correction at runtime. At boot time, when bit error rates are higher, the scheme uses VLEWs to efficiently ensure reliable data survival for a week to a year without refresh by correcting a large number of bit errors at low storage cost. At runtime, when bit error rates are lower, it reuses each memory block's chip failure protection bits to opportunistically correct bit errors at high performance. The proposal incurs a total storage cost of 27%. Compared to a bit error correction scheme, the proposal adds chip failure protection at no additional storage cost and at 2% average performance overhead." @default.
- W2904216795 created "2018-12-22" @default.
- W2904216795 creator A5061044305 @default.
- W2904216795 creator A5066881042 @default.
- W2904216795 creator A5077598145 @default.
- W2904216795 date "2018-10-01" @default.
- W2904216795 modified "2023-09-27" @default.
- W2904216795 title "Exploring and Optimizing Chipkill-Correct for Persistent Memory Based on High-Density NVRAMs" @default.
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- W2904216795 doi "https://doi.org/10.1109/micro.2018.00063" @default.
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