How do you estimate capacity savings with the Real-time Compression Feature?

IBM provides a tool called Comprestimator, which is a command-line utility which can be ran on a variety of hosts and is used to get an estimate of the expected compression rate for block storage devices.

The utility works on the following host types:

  • Red Hat Enterprise Linux Version 5 (64-bit)
  • ESXi 4.0, 5.0
  • AIX V6.1, V7.1
  • HP-UX 11i v3
  • Windows 2003 Server, Windows 2008 Server (32-bit and 64-bit)

More information on the tool and the download location is available at the following URL:

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