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Preventing Fast Wear-out of Flash Cache with An Admission Control Policy

Title
Preventing Fast Wear-out of Flash Cache with An Admission Control Policy
Authors
Lee, EunjiBahn, Hyokyung
Ewha Authors
반효경
SCOPUS Author ID
반효경scopus
Issue Date
2015
Journal Title
JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE
ISSN
1598-1657JCR Link2233-4866JCR Link
Citation
vol. 15, no. 5, pp. 546 - 553
Keywords
Flash cacheadmission controlreplacement policyflash memoryLRU
Publisher
IEEK PUBLICATION CENTER
Indexed
SCIE; SCOPUS; KCI WOS scopus
Abstract
Recently, flash cache is widely adopted as the performance accelerator of legacy storage systems. Unlike other cache media, flash cache should be carefully managed as it has peculiar characteristics such as long write latency and limited P/E cycles. In particular, we make two prominent observations that can be utilized in managing flash cache. First, a serious worn-out problem happens when the working-set of a system is beyond the capacity of flash cache due to excessively frequent cache replacement. Second, more than 50% of data has no hit in flash cache as it is a second level cache. Based on these observations, we propose a cache admission control policy that does not cache data when it is first accessed, and inserts it into the cache only after its second access occurs within a certain time window. This allows the filtering of data disruptive to flash cache in terms of endurance and performance. With this policy, we prolong the lifetime of flash cache 2.3 times without any performance degradations.
DOI
10.5573/JSTS.2015.15.5.546
Appears in Collections:
엘텍공과대학 > 컴퓨터공학과 > Journal papers
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