Installation Guide and Reference

Default Paging Space During BOS Installation Through NIM

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.