An empirical study of redundant array of independent solid-state drives (RAIS)

Kim, Youngjae

doi:10.1007/s10586-015-0421-4

Title: An empirical study of redundant array of independent solid-state drives (RAIS)

Journal Article · Sat Jan 31 00:00:00 EST 2015 · Cluster Computing

DOI:https://doi.org/10.1007/s10586-015-0421-4· OSTI ID:1565286

Kim, Youngjae ^[1]

Ajou Univ., Suwon (South Korea). Dept. of Information and Computer Engineering

Solid-state drives (SSD) are popular storage media devices alongside magnetic hard disk drives (HDD). SSD flash chips are packaged in HDD form factors and SSDs are compatible with regular HDD device drivers and I/O buses. This compatibility allows easy replacement of individual HDDs with SSDs in existing storage systems. However, under certain circumstances, SSD write performance can be significantly slowed by garbage collection (GC) processes. The frequency of GC activity is directly correlated with the frequency of inside-SSD write operations and the amount of data written to it. GC scheduling is locally controlled by an internal SSD logic. Here, this paper studies the feasibility of Redundant Arrays of Independent Flash-based Solid-state drives (RAIS). We empirically analyze the RAIS performance using commercially-off-the-shelf (COTS) SSDs. We investigate the performance of various RAIS configurations under a variety of I/O access patterns. Finally, we present our performance and cost comparisons of RAIS with a fast, PCIe-based COTS SSD, in terms of performance and cost.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1565286

Journal Information:: Cluster Computing, Vol. 18, Issue 2; ISSN 1386-7857

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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