Setting default paging space during BOS installation through NIM

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In AIX® 4.3 or later, default paging space is set by the BOS installation process when installing through NIM.

Default paging space is set by the BOS installation process, if the following conditions are met:
  • The method of installation is overwrite.
  • Neither an image_data resource nor an image.data file on the diskette is specified for the installation.
  • The source of the BOS image is not a mksysb image.
  • The source of the BOS image is a SPOT, and the default image.data file contains more than one entry for paging. This file is located at: 
    (spot_location)/lpp/bosinst/image_template
  • The source of the BOS image is a SPOT, and the LPs value for the single paging entry is set to the default value of 16.
The default paging size is calculated from the smaller value of optimal_ps and recommended_ps where:
  • RAM = amount of memory on the target system measured in megabytes (MB).
  • optimal_ps = maximum between RAM and (0.2 size of rootvg)
  • IF CDE (Common Desktop Environment) is installed, recommmended_ps =
    • amount of RAM is less than 32 MB, then recommended_ps = 3 * RAM
    • amount of RAM is 32 MB or more, then recommended_ps = RAM + 64 MB
  • IF CDE (Common Desktop Environment) is not installed, recommmended_ps =
    • amount of RAM is less than 32 MB, then recommended_ps = 2 * RAM
    • amount of RAM is 32 MB or more, then recommended_ps = RAM + 32 MB

The default paging space set by this process is never greater than 512 MB.