Reducing Paging Space %Used

Question Reducing Paging Space %Used

Answer

This document provides some ways to reduce the '%Used' paging space. This information applies to AIX Version 5L. This example starts with a single paging space of 45% used. #lsps -a Page Space PV VG Size %Used Active Auto Type hd6 hdisk0 rootvg 128MB 45 yes yes lv Create a second paging space of the same size by entering: #mkps -s 32 -n vg00 hdisk1 paging00 Now, you should have two paging spaces similar to the following: #lsps -a Page Space PV VG Size %Used Active Auto Type paging00 hdisk1 vg00 128MB 1 yes no lv hd6 hdisk0 rootvg 128MB 45 yes yes lv Turn off the original paging space. #swapoff /dev/hd6 Now, it is 0% used and Active=no. #lsps -a Page Space PV VG Size %Used Active Auto Type paging00 hdisk1 vg00 128MB 2 yes no lv hd6 hdisk0 rootvg 128MB 0 no yes lv Turn the original paging space back on by entering: #swapon /dev/hd6 The second paging space can be turned off and removed by entering: #swapoff /dev/paging00 #rmps paging00 You should now be back to your original paging space, but only 2% used. #lsps -a Page Space PV VG Size %Used Active Auto Type hd6 hdisk0 rootvg 128MB 2 yes yes lv --------- Why did this work? When the /etc/swapoff command ran, it moves pages from the hd6paging space to the paging00 paging space. However, if a page on the hd6paging device was active in physical memory (it has been paged in), the command will not move that page to paging00.h

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