On my AIX 6.1 boxes, after DLPARing more memory to the LPAR, I like to have the paging space shrunk back down so I can see if it continues to page more. Instead of taking an outage and rebooting the box to shrink the paging space, assuming there is only one paging space on the box named hd6, I do it like this:

First find how many LPs are being used by your current paging space:

Code:

host:/:$ lslv hd6 | grep PPs
LPs:                64                     PPs:            64
STALE PPs:          0                      BB POLICY:      non-relocatable
host:/:$

Make a new temporary paging space:

Code:

mkps -s 64 -n rootvg

Turn off the primary paging space. All the necessary paging space entries will be moved to the new paging space previous created:

Code:

swapoff /dev/hd6

Turn the original paging space back on:

Code:

swapon  /dev/hd6

Turn off the temporary paging space. It should have been named "paging00" by default (verify the name with "lsps -a"):

Code:

swapoff /dev/paging00

Remove the temporary paging space

Code:

rmps    paging00

Run the "lsps -a" afterward to see the new size. This usually drops my paging space back down to around 3%-ish. I'm not 100% sure this will work on an AIX 5.1 box though.