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 SSR: Smart Suspend/Resume Technique for High Capacity 3D NAND Flash Memory Based Storage System 


Vol. 50,  No. 9, pp. 1466-1477, Sep.  2025
10.7840/kics.2025.50.9.1466


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  Abstract

As NAND flash technology continues to scale, flash-based SSDs have become key components in storage systems. One of the main design goals for modern storage systems is low read tail latency, which is crucial for state-of-the-art applications such as data centers or LLM. Towards this goal, prior works on erase suspension address this problem by allowing a read operation to interrupt an ongoing erase operation. Unfortunately, the conventional technique attempts to suspend/resume an erase pulse at an arbitrary point, which incurs additional hardware costs for NAND peripherals and significantly reduces the SSD's lifetime. Furthermore, the previous technique suffers from an erase/write starvation problem. To overcome these limitations, we propose a new suspend/resume technique, SSR (Smart Suspend Resume), leveraging the ISPE mechanism used in modern SSDs. The SSR introduces multiple safe points within a single erase loop based on a device model using 160 real 3D TLC flash chips, and performs suspend/resume erase operations at well-aligned safe points. By doing so, we can limit the frequency of suspend/resume operations, thus effectively avoiding reliability degradation and erase/write starvation problems. Comprehensive evaluations reveal that our SSR can improve the read tail latency up to 10 times over the baseline for two popular workloads.

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  Cite this article

[IEEE Style]

B. Kim, G. Seo, M. Kim, "SSR: Smart Suspend/Resume Technique for High Capacity 3D NAND Flash Memory Based Storage System," The Journal of Korean Institute of Communications and Information Sciences, vol. 50, no. 9, pp. 1466-1477, 2025. DOI: 10.7840/kics.2025.50.9.1466.

[ACM Style]

Beomjun Kim, Gyeongseob Seo, and Myungsuk Kim. 2025. SSR: Smart Suspend/Resume Technique for High Capacity 3D NAND Flash Memory Based Storage System. The Journal of Korean Institute of Communications and Information Sciences, 50, 9, (2025), 1466-1477. DOI: 10.7840/kics.2025.50.9.1466.

[KICS Style]

Beomjun Kim, Gyeongseob Seo, Myungsuk Kim, "SSR: Smart Suspend/Resume Technique for High Capacity 3D NAND Flash Memory Based Storage System," The Journal of Korean Institute of Communications and Information Sciences, vol. 50, no. 9, pp. 1466-1477, 9. 2025. (https://doi.org/10.7840/kics.2025.50.9.1466)
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