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Apparatus and method to archive log entries formed by a data storage system

  • US 7,778,974 B2
  • Filed: 10/14/2007
  • Issued: 08/17/2010
  • Est. Priority Date: 10/14/2007
  • Status: Expired due to Fees
First Claim
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1. A method to archive log entries created by a data storage system, comprising the steps of:

  • providing a data storage system comprising first memory and a library log encoded in said first memory;

    writing a plurality of log entries to said library log, wherein each log entry comprises a log entry time;

    encoding a log archive in a second memory, wherein said second memory is external to said data storage system;

    setting a time T0 equal to current time;

    at time T0, copying to said log archive said plurality of log entries written to said library log;

    determining a time T1 when an earliest log entry was written to said library log;

    determining a time T2 when a latest log entry was written to said library log;

    calculating a log interval TINT equal to (T2

    T1);

    setting a retrieval time equal to (T0+TINT);

    determining whether to perform an intermediate inspection of the library log;

    when performing an intermediate inspection of the library log, determining a number (N) of log entries written to library log retrieved at time T0;

    establishing a previous log filling rate equal to (N)/TINT;

    setting an intermediate sampling interval TS, wherein said intermediate sampling interval is less than said log interval;

    setting an intermediate sampling time, wherein said intermediate sampling time equals (T0+TS);

    when current time equals said intermediate sampling time, inspecting the library log created after time T0;

    determining a number (M) of log entries written to the library log after time T0;

    establishing a current log filling rate equal to (M)/TS;

    determining whether said current log filling rate is greater than said previous log filling rate; and

    when said current log filling rate is greater than said previous log filling rate, adjusting said log interval TINT to be less than (T2

    T1).

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