NDLI: Hystor: making the best use of solid state drives in high performance storage systems

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Hystor: making the best use of solid state drives in high performance storage systems

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Hystor: making the best use of solid state drives in high performance storage systems

Content Provider	ACM Digital Library
Author	Zhang, Xiaodong Chen, Feng Koufaty, David A.
Abstract	With the fast technical improvement, flash memory based Solid State Drives (SSDs) are becoming an important part of the computer storage hierarchy to significantly improve performance and energy efficiency. However, due to its relatively high price and low capacity, a major system research issue to address is on how to make SSDs play their most effective roles in a high-performance storage system in cost- and performance-effective ways. In this paper, we will answer several related questions with insights based on the design and implementation of a high performance hybrid storage system, called Hystor. We make the best use of SSDs in storage systems by achieving a set of optimization objectives from both system deployment and algorithm design perspectives. Hystor manages both SSDs and hard disk drives (HDDs) as one single block device with minimal changes to existing OS kernels. By monitoring I/O access patterns at runtime, Hystor can effectively identify blocks that (1) can result in long latencies or (2) are semantically critical (e.g. file system metadata), and stores them in SSDs for future accesses to achieve a significant performance improvement. In order to further leverage the exceptionally high performance of writes in the state-of-the-art SSDs, Hystor also serves as a write-back buffer to speed up write requests. Our measurements on Hystor implemented in the Linux kernel 2.6.25.8 show that it can take advantage of the performance merits of SSDs with only a few lines of changes to the stock Linux kernel. Our system study shows that in a highly effective hybrid storage system, SSDs should play a major role as an independent storage where the best suitable data are adaptively and timely migrated in and retained, and it can also be effective to serve as a write-back buffer.
Starting Page	22
Ending Page	32
Page Count	11
File Format	PDF
ISBN	9781450301022
DOI	10.1145/1995896.1995902
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-05-31
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Hard disk drive Hybrid storage system Solid state drive
Content Type	Text
Resource Type	Article

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