The Rio file cache

  • Peter M. Chen
    Computer Science and Engineering Division, Department of Electrical Engineering and Computer Science, University of Michigan
  • Wee Teck Ng
    Computer Science and Engineering Division, Department of Electrical Engineering and Computer Science, University of Michigan
  • Subhachandra Chandra
    Computer Science and Engineering Division, Department of Electrical Engineering and Computer Science, University of Michigan
  • Christopher Aycock
    Computer Science and Engineering Division, Department of Electrical Engineering and Computer Science, University of Michigan
  • Gurushankar Rajamani
    Computer Science and Engineering Division, Department of Electrical Engineering and Computer Science, University of Michigan
  • David Lowell
    Computer Science and Engineering Division, Department of Electrical Engineering and Computer Science, University of Michigan

書誌事項

タイトル別名
  • surviving operating system crashes

抄録

<jats:p> One of the fundamental limits to high-performance, high-reliability file systems is memory's vulnerability to system crashes. Because memory is viewed as unsafe, systems periodically write data back to disk. The extra disk traffic lowers performance, and the delay period before data is safe lowers reliability. The goal of the Rio (RAM I/O) file cache is to make ordinary main memory safe for persistent storage by enabling memory to survive operating system crashes. Reliable memory enables a system to achieve the best of both worlds: reliability equivalent to a write-through file cache, where every write is instantly safe, and performance equivalent to a pure write-back cache, with no reliability-induced writes to disk. To achieve reliability, we protect memory during a crash and restore it during a reboot (a "warm" reboot). Extensive crash tests show that even without protection, warm reboot enables memory to achieve reliability close to that of a write-through file system. Adding protection makes memory even <jats:italic>safer</jats:italic> than a write-through file system while adding essentially no overhead. By eliminating reliability-induced disk writes, Rio performs 4-22 times as fast as a write-through file system, 2-14 times as fast as a standard Unix file system, and 1-3 times as fast as an optimized system that risks losing 30 seconds of data and metadata. </jats:p>

収録刊行物

  • ACM SIGPLAN Notices

    ACM SIGPLAN Notices 31 (9), 74-83, 1996-09

    Association for Computing Machinery (ACM)

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