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Method and system for data compression and compression estimation in a virtual tape library environment

  • US 7,437,492 B2
  • Filed: 05/14/2003
  • Issued: 10/14/2008
  • Est. Priority Date: 05/14/2003
  • Status: Active Grant
First Claim
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1. A method for dynamically computing an estimated compression ratio comprising:

  • compressing a predetermined number of random samples of data written to a virtual tape library;

    measuring a compression ratio achieved when the samples are compressed;

    measuring a deviation of compression ratios between two statistical measures;

    computing an average estimated compression ratio of the data written to the virtual tape library; and

    providing an end-of-tape signal based on the average estimated compression ratio indicating when to stop writing data to a virtual tape of the virtual tape library.

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