NDLI: ACR: An Adaptive Cost-Aware Buffer Replacement Algorithm for Flash Storage Devices

Content Provider	IEEE Xplore Digital Library
Author	Xian Tang Xiaofeng Meng
Copyright Year	2010
Abstract	Flash disks are being widely used as an important alternative to conventional magnetic disks, although accessed through the same interface by applications, their distinguished feature, i.e., different read and write cost in the aspects of time, makes it necessary to reconsider the design of existing replacement algorithms to leverage their performance potential. Different from existing flash-aware buffer replacement policies that focus on the asymmetry of read and write operations, we address the “discrepancy” of the asymmetry for different flash disks, which is the fact that exists for a long time, while has drawn little attention by researchers since most existing flash-aware buffer replacement polices are somewhat based on the assumption that the cost of read operation is neglectable compared with that of write operation. In fact, this is not true for current flash disks on the market. We propose an adaptive cost-aware replacement policy (ACR) that uses three cost-based heuristics to select the victim page, thus can fairly make trade off between clean pages (their content remain unchanged) and dirty pages (their content is modified), and hence, can work well for different type of flash disks of large discrepancy. Further, in ACR, buffer pages are divided into clean list and dirty list, the newly entered pages will not be inserted at the MRU position of either list, but at some position in the middle, thus the once-requested pages can be flushed out from the buffer quickly and the frequently-requested pages can stay in buffer for a longer time. Such mechanism makes ACR adaptive to workloads of different access patterns. The experimental results on different traces and flash disks show that ACR not only adaptively tunes itself to workloads of different access patterns, but also works well for different kind of flash disks compared with existing methods.
Starting Page	33
Ending Page	42
File Size	333822
Page Count	10
File Format	PDF
ISBN	9781424470754
e-ISBN	9781424470761
DOI	10.1109/MDM.2010.34
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-05-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Buffer storage Costs Operating systems Magnetic devices Algorithm design and analysis Energy storage Databases Conference management Mobile computing Delay
Content Type	Text
Resource Type	Article

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