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Analyzing drive errors in data storage systems

  • US 8,566,637 B1
  • Filed: 12/23/2010
  • Issued: 10/22/2013
  • Est. Priority Date: 12/23/2010
  • Status: Active Grant
First Claim
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1. A method for use in analyzing drive errors in data storage systems, the method comprising:

  • maintaining an error tag and total good I/O count for a drive;

    for each failed I/O;

    retrieving an error weight per error;

    calculating a new error tag from the error weight, a previous error tag, and the total good I/O count; and

    calculating an error ratio from the new error tag and a total I/O count;

    comparing the error ratio with thresholds;

    if one or more of the thresholds has been crossed, taking an action on the drive; and

    reducing the error tag as good I/O is produced.

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