Paper Info
Title
Using transparent compression to improve SSD-based I/O caches
Abstract
Flash-based solid state drives (SSDs) offer superior performance over hard disks for many workloads. A prominent use of SSDs in modern storage systems is to use these devices as a cache in the I/O path. In this work, we examine how transparent, online I/O compression can be used to increase the capacity of SSD-based caches, thus increasing the costeffectiveness of the system. We present FlaZ, an I/O system that operates at the block-level and is transparent to existing file-systems. To achieve transparent, online compression in the I/O path and maintain high performance, FlaZ, provides support for variable-size blocks, mapping of logical to physical blocks, block allocation, and cleanup. FlaZ, mitigates compression and decompression overheads that can have a significant impact on performance by leveraging modern multicore CPUs. We implement FlaZ, in the Linux kernel and evaluate it on a commodity server with multicore CPUs, using TPC-H, PostMark, and SPECsfs. Our results show that compressed caching trades off CPU cycles for I/O performance and enhances SSD efficiency as a cache by up to 99%, 25%, and 11% for each workload, respectively.
Year
DOI
Venue
2010
10.1145/1755913.1755915
EuroSys
Keywords
DocType
Citations 
modern multicore cpus,o path,o performance,ssd-based cache,transparent compression,o cache,online compression,high performance,o system,o compression,mitigates compression,superior performance,storage system,evaluation
Conference
32
PageRank 
References 
Authors
1.16
21
5
Name
Order
Citations
PageRank
Thanos Makatos1452.14
Yannis Klonatos21136.56
Manolis Marazakis313620.29
Michail D. Flouris41319.38
Angelos Bilas559860.49