Overcoming a Zone Reclaiming Overhead with Partial-Zone Reclaiming
Published in Journal of KIISE: Computer Systems and Theory, Vol. 51, No. 2, pp. 115–124, 2024
Recommended citation: Inho Song, Wonjin Lee, Jae-Dong Lee, Seehwan Yoo, and Jongmoo Choi. "Overcoming a Zone Reclaiming Overhead with Partial-Zone Reclaiming." Journal of KIISE: Computer Systems and Theory, vol. 51, no. 2, pp. 115–124, 2024. (Korean) https://dspace.kci.go.kr/handle/kci/2110970
Inho Song, Wonjin Lee, Jae-Dong Lee, Seehwan Yoo, and Jongmoo Choi. Journal of KIISE: Computer Systems and Theory, 51(2):115–124, 2024. (Korean journal article.)
Abstract
Zone reclaiming on ZNS SSDs is a heavyweight operation that delays in-flight host requests while the zone is being reclaimed. We propose Partial-Zone Reclaiming, which interleaves the reclamation process with in-flight host I/O rather than blocking it end-to-end. In our experiments, partial-zone reclaiming improves host request latency by up to 8% on average and reduces zone reclaiming time by up to 41%.