CORFU: a shared log design for flash clusters

  • Authors:

  • Mahesh Balakrishnan;Dahlia Malkhi;Vijayan Prabhakaran;Ted Wobber;Michael Wei;John D. Davis

  • Affiliations:

  • Microsoft Research Silicon Valley;Microsoft Research Silicon Valley;Microsoft Research Silicon Valley;Microsoft Research Silicon Valley;University of California, San Diego;Microsoft Research Silicon Valley

  • Venue:
  • NSDI'12 Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation
  • Year:
  • 2012

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Abstract

CORFU organizes a cluster of flash devices as a single, shared log that can be accessed concurrently by multiple clients over the network. The CORFU shared log makes it easy to build distributed applications that require strong consistency at high speeds, such as databases, transactional key-value stores, replicated state machines, and metadata services. CORFU can be viewed as a distributed SSD, providing advantages over conventional SSDs such as distributed wear-leveling, network locality, fault tolerance, incremental scalability and geo-distribution. A single CORFU instance can support up to 200K appends/sec, while reads scale linearly with cluster size. Importantly, CORFU is designed to work directly over network-attached flash devices, slashing cost, power consumption and latency by eliminating storage servers.