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대용량 SSD를 위한 요구 기반 FTL 캐시 분리 기법

Title
대용량 SSD를 위한 요구 기반 FTL 캐시 분리 기법
Translated Title
Demand-based FTL Cache Partitioning for Large Capacity SSDs
Authors
배진욱김한별임준수이성진
DGIST Authors
이성진
Issue Date
2019-04
Citation
대한임베디드공학회논문지, 14(2), 71-78
Type
Article
Author Keywords
DFTLAddress translationCache partitioningTail latencyWrite amplification
ISSN
1975-5066
Abstract
As the capacity of SSDs rapidly increases, the amount of DRAM to keep a mapping table size in SSDs becomes very huge. To address a Demand-based FTL (DFTL) scheme that caches part of mapping entries in DRAM is considered to be a feasible alternative. However, owing to its unpredictable behaviors, DFTL fails to provide consistent I/O response times. In this paper, we a) analyze a root cause that results in fluctuation on read latency and b) propose a new demand-based FTL scheme that ensures guaranteed read response time with low write amplification. By preventing mapping evictions while serving reads, the proposed technique guarantees every host read requests to be done in 2 NAND read operations. Moreover, only with 25% of a cache ratio, the proposed scheme improves random write performance and random mixed performance by 1.65x and 1.15x, respectively, over the traditional DFTL.
URI
http://hdl.handle.net/20.500.11750/9830
DOI
10.14372/IEMEK.2019.14.2.71
Publisher
대한임베디드공학회
Related Researcher
  • Author Lee, Sungjin Data-Intensive Computing Systems Laboratory
  • Research Interests Computer System, System Software, Storage System, Non-volatile Memory, Flash-based SSD, Distributed Storage Systems
Files:
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Collection:
Department of Information and Communication EngineeringData-Intensive Computing Systems Laboratory1. Journal Articles


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