Method and system for data compression and compression estimation in a virtual tape library environment
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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Abstract
A method and system for efficiently storing and transferring data in a virtual tape library environment is disclosed. Data is written to a virtual tape library that emulates a physical tape library. Data stored in the virtual tape library may be compressed and an estimated compression ratio may be dynamically computed. While data is written to the virtual tape library, an end-of-tape signal is provided based on the estimated compression ratio.
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Citations
16 Claims
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1. A method for dynamically computing an estimated compression ratio comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for efficiently storing and transferring data in a virtual tape library, the system comprising:
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a compressor compressing data written to the virtual tape library; and a compression estimator for computing an estimated compression ratio, the compression estimator; configured to compress a predetermined number of random samples of data written to the virtual tape library, measure a compression ratio achieved when the samples are compressed, measure a deviation of compression ratios between two statistical measures, compute an average estimated compression ratio of the data written to the virtual tape library and provide an end-of-tape signal based on the average estimated compression ratio, the end-of-tape signal indicating when to stop writing data to a virtual tape of the virtual tape library. - View Dependent Claims (15, 16)
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Specification