Comprestimator is a command-line host-based utility that can be used to estimate
the expected compression rate for block-devices. The utility uses advanced
mathematical and statistical algorithms to perform sampling and analysis
efficiently. The utility also displays its accuracy level by showing the compression
accuracy range of the results that are achieved based on the formulas it uses,
deviating plus or minus 5 percent based on the formulas that are used by the
RACE implementation.
The utility runs on a host that has access to the devices to be analyzed. It runs
only read operations, so it has no effect on the data that is stored on the device.
The following links provide useful information about installing Comprestimator on
a host and using it to analyze devices on that host: Comprestimator Utility and
Comprestimator Utility Version 1.5.2.2.
For more information on Comprestimator, refer to the IBM Real-time Compression on
the IBM XIV Storage System (REDP-5215) Redpaper at http://
www.redbooks.ibm.com/redpieces/abstracts/redp5215.html?Open&pdfbookmark.
10 IBM XIV Gen3 281x-11x, 281x-21x, and 281x-314 Planning Guide
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