Subpage-Aware Solid State Drive for Improving Lifetime and Performance

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The manufacturers of NAND flash-based solid-state drives (SSDs) are increasing capacity and throughput by enlarging their page size, which is the minimum I/O unit in the NAND flash chips. Because the host and NAND flash chips have different I/O granularity units, the number of subpage requests increases. However, these subpage requests, especially writes, can cause internal fragmentation and endurance problems. Furthermore, subpage write requests inevitably involve read-modify-write (RMW) operations that increase the write response time because of the out-place-update feature in the NAND flash chips. In this paper, we propose a subpage-aware SSD to increase the lifetime and performance by reducing the number of NAND writes and eliminating unnecessary RMW operations. Our scheme attempts to merge subpage write requests to full page write requests in the write buffer to reduce the number of NAND writes and adds size information to the mapping table to detect unnecessary RMW operations. Our proposed scheme reduces the number of NAND writes by up to 30 and 19 percent on average and the write response time by up to 22 and 13 percent on average. © 1968-2012 IEEE.
Publisher
IEEE COMPUTER SOC
Issue Date
2018-10
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON COMPUTERS, v.67, no.10, pp.1492 - 1505

ISSN
0018-9340
DOI
10.1109/TC.2018.2827033
URI
http://hdl.handle.net/10203/248751
Appears in Collection
CS-Journal Papers(저널논문)
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