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LAWC: Optimizing Write Cache Using Layout-Aware I/O Scheduling for All Flash Storage

Authors
이중희
Issue Date
11월-2017
Publisher
IEEE COMPUTER SOC
Citation
IEEE TRANSACTIONS ON COMPUTERS, v.66, no.11, pp.1890 - 1902
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON COMPUTERS
Volume
66
Number
11
Start Page
1890
End Page
1902
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/139807
ISSN
0018-9340
Abstract
Flash memory-based SSD-RAIDs are swiftly replacing conventional hard disk drives by exhibiting improved performance and stability, especially in I/O-intensive environments. However, the variations in latency and throughput occurring due to uncoordinated internal garbage collection cripples further boosting of performance. In addition, the unwanted variations in each SSD can influence the overall performance of the entire flash storage adversely. This performance bottleneck can be essentially reduced by an internal write cache in the RAID controller designed prudently by considering the crucial device characteristics. The state-of-the-art cache write for the RAID controller fails to incorporate device characteristics of flash memory-based SSDs and mitigates the performance gain. In this paper, we propose a novel cache design namely Layout-Aware Write Cache (LAWC) to overcome the performance barrier inculcated by independent garbage collections. LAWC implements (i) improved I/O scheduling for logically partitioned write caches, (ii) a destage write synchronization mechanism to allow individual write caches to flush write blocks into the SSD array in a coordinated manner, and (iii) a two-level hybrid cache algorithm utilizing small front level cache for the improved write cache effi
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