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DTSTAMP:20260402T024534Z
LOCATION:3008\, Level 3
DTSTART;TZID=America/Los_Angeles:20250625T113000
DTEND;TZID=America/Los_Angeles:20250625T114500
UID:dac_DAC 2025_sess159_RESEARCH1301@linklings.com
SUMMARY:FineRR-ZNS: Enabling Fine-Granularity Read Refreshing for ZNS SSDs
DESCRIPTION:Jun Li (Nanjing University of Posts and Telecommunications); Z
 hibing Sha and Yang Fan (Southwest University); Xiaofei Xu (RMIT Universit
 y, Australia); Xiaobai Chen and Jieming Yin (Nanjing University of Posts a
 nd Telecommunications); and Jianwei Liao (Southwest University of China)\n
 \nZoned namespace (ZNS) SSDs are emerging stor- age devices offering low c
 ost, high performance, and software definability. By adopting host-managed
  zone-based sequential programming, ZNS SSDs effectively eliminate the spa
 ce over- head associated with on-board DRAM memory and garbage collection.
  However, while background read refreshing serves as a background data pro
 tection mechanism in conventional block-interface SSDs, the state-of-the-a
 rt ZNS SSDs lack read refreshing functionality to guarantee the data relia
 bility. More- over, implementing zone-level read refreshing in ZNS SSDs in
 curs significant overhead due to the large volume of valid data movements 
 in a zone, leading to degraded I/O performance.\nTo efficiently enable rea
 d refreshing for ZNS SSDs, this paper proposes FineRR-ZNS, a fine-granular
 ity read refreshing mechanism for ZNS SSDs. FineRR-ZNS employs a host-cont
 rolled fine- granularity read refreshing scheme that selectively determine
 s block-level read refreshing via metadata remapping. Additionally, a zone
  reconstruction method is designed to retrieve remapped data forming compl
 ete data during zone-level RR. Specially, the remapped data after zone rec
 onstruction are still available and prioritized for read accesses until th
 eir respective block needs next RR. Experimental evaluations with RocksDB 
 benchmarks show that FineRR-ZNS significantly enhances read refreshing eff
 iciency and I/O throughput compared to zone-level read refreshing implemen
 ted in the state-of-the-art ZenFS file system.\n\nTopics: Systems\n\nTrack
 s: SYS5: Embedded Memory and Storage Systems\n\nSession Chairs: Nima Taher
 iNejad (Heidelberg University) and Jalil Boukhobza (ENSTA)\n\n
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