High performance & low latency in solid-state drives through redundancy

  • Authors:

  • Dimitris Skourtis;Dimitris Achlioptas;Carlos Maltzahn;Scott Brandt

  • Affiliations:

  • University of California, Santa Cruz;University of California, Santa Cruz;University of California, Santa Cruz;University of California, Santa Cruz

  • Venue:
  • Proceedings of the 1st Workshop on Interactions of NVM/FLASH with Operating Systems and Workloads
  • Year:
  • 2013

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Abstract

Solid-state drives are becoming increasingly popular in enterprise storage systems, playing the role of large caches and permanent storage. Although SSDs provide faster random access than hard-drives, their performance under read/write workloads is highly variable often exceeding that of hard-drives (e.g., taking 100ms for a single read). Many systems with mixed workloads have low latency requirements, or require predictable performance and guarantees. In such cases, the performance variance of SSDs becomes a problem for both predictability and raw performance. In this paper, we propose a design based on redundancy, which provides high performance and low latency for reads under read/write workloads by physically separating reads from writes. More specifically, reads achieve read-only performance while writes perform at least as good as before. We evaluate our design using micro-benchmarks and real traces, illustrating the performance benefits of read/write separation in solid-state drives.