AIX 5L Problem Determination - IBM Redbooks

7.5.3 Reducing and removing paging space
In AIX Version 4.x, to remove a paging space you need to reboot the system,
since there is no way to dynamically bring a paging space offline. Once the
system reboots, the paging space will not be active. At this point, you can
remove the paging space logical volume.
In AIX Version 4.x, to reduce the size of the paging space, you should remove
the logical volume, and then create the new paging space with the desired size.
The new paging space can be activated without having to reboot the machine
using the mkps command.
Removing paging space can be done by using the following procedure involving
the chps and the rmps commands.
Note: Removing default paging spaces incorrectly can prevent the system
from restarting.
The paging space must be deactivated before it can be removed. A special
procedure is required for removing the default paging spaces (hd6, hd61, and
so on). These paging spaces are activated during boot time by shell scripts
that configure the system. To remove one of the default paging spaces, these
scripts must be altered and a new boot image must be created.
This scenario describes how to remove an existing paging space, paging00, from
the system. This disk layout is as follows:
# lsps -a
Page Space Physical Volume Volume Group Size %Used Active Auto Typ
paging00 hdisk2 testvg 3200MB 1 yes yes lv
hd6 hdisk0 rootvg 1040MB 1 yes yes lv
1. The paging00 paging space is automatically activated. Use the chps
command to change its state:
# chps -a n paging00
2. The paging space is in use; a reboot of the system is required. Make sure that
the system dump device is still pointing to a valid paging space, as follows:
# sysdumpdev -l
primary /dev/hd6
secondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression OFF
168 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques