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Open Access Publications from the University of California

Ceph: A Scalable, High-Performance Distributed File System

  • Author(s): Weil, Sage
  • Brandt, Scott A
  • Miller, Ethan L
  • Long, Darrell D. E.
  • Maltzahn, Carlos
  • et al.

We have developed Ceph, a distributed file system that provides excellent performance, reliability, and scala- bility. Ceph maximizes the separation between data and metadata management by replacing allocation ta- bles with a pseudo-random data distribution function (CRUSH) designed for heterogeneous and dynamic clus- ters of unreliable object storage devices (OSDs). We leverage device intelligence by distributing data replica- tion, failure detection and recovery to semi-autonomous OSDs running a specialized local object file system. A dynamic distributed metadata cluster provides extremely efficient metadata management and seamlessly adapts to a wide range of general purpose and scientific comput- ing file system workloads. Performance measurements under a variety of workloads show that Ceph has ex- cellent I/O performance and scalable metadata manage- ment, supporting more than 250,000 metadata operations per second.

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