![background image](http://html1.mh-extra.com/html/ibm/xiv-gen3-series/xiv-gen3-series_planning-manual_4145274034.webp)
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
Summary of Contents for XIV Gen3 Series
Page 6: ...vi IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 8: ...viii IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 10: ...x IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 16: ...xvi IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 24: ...xxiv IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 52: ...28 IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 88: ...64 IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 94: ...70 IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 116: ...92 IBM XIV Gen3 281x 11x 281x 21x and 281x 314 Planning Guide...
Page 125: ......
Page 126: ...IBM Printed in USA SC27 5412 09...