TITLE    : Howto reduce the default paging space (hd6)
OS LEVEL : AIX 4.x
DATE     : 08/03/99
VERSION  : 1.0

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1.  Determine how many paging space LVs exist on the system using:
	
    lsps -a

    If there is only one this will be known as hd6. However, if there is 
    more than one in rootvg, note the names.

2.  Check the number of free PPs available in rootvg using:

    lsvg -p rootvg

3.  Create a paging space to be used temporarily during this exercise using:

    mkps -s X -a rootvg

    (where X is a number between 1 and the number of free PPs shown in part 
     2 above, e.g. 20)
    Check the name of the new, temporary paging space using the 'lsps -a' 
    command again. It will probably be paging00.

4.  Change the characteristics of hd6 so that it will be inactive at the 
    next reboot:

    chps -a n hd6

5.  Edit the file /sbin/rc.boot.

    Change "swapon /dev/hd6" to "swapon /dev/pagingXX" 
    where XX is the number of the new paging space created in step 3.

6.  Determine which is the boot disk using:

    lslv -m hd5

    NB: If the system is a /usr client, a diskless client or a dataless 
    client, do not go beyond this point.

7.  Run the bosboot command:

    bosboot -a -d /dev/hdisk#

    where # represents the number of the disk determined in step 6.

8.  Reboot the system to inactivate hd6:

    shutdown -Fr

9.  hd6 cannot be removed while it is the default dump device. To check the
    dump device:

    sysdumpdev -l

    If hd6 is set as either the primary or secondary dump device, reset the
    pointer using:

    sysdumpdev -P -p /dev/sysdumpnull  (if hd6 is the primary dump device)

    sysdumpdev -P -s /dev/sysdumpnull  (if hd6 is the secondary dump device)


    NB: the -P flag sets the dump device permanently. If this is not used,
        it will revert back to the default value of hd6 on reboot.

10.  Remove hd6 and create a new, smaller hd6 using:

     rmps hd6

     mklv -y hd6 -t paging rootvg SIZE

     where SIZE is the PS size in LPs.

     NB: the new paging space should be created as hd6 due to some scripts 
         being hard-coded to activate /dev/hd6.

11.  Edit /sbin/rc.boot. Change "swapon /dev/pagingXX" to "swapon /dev/hd6"

12.  Check that hd6 is marked to be automatically swapped on at boot time 
     using:

     lsps -a

     There should be a "y" under the "auto" column. If  there is an "n", 
     run:

     chps -a y hd6

13.  Run the bosboot command using the disk determined in step 6, as before:

     bosboot -a -d /dev/hdisk#

     If a temporary paging space was not created, this procedure is now 
     finished. If you used a temporary paging space, continue to the end of 
     this document.

14.  Change the temporary paging space to be inactive on the next reboot:

     chps -a n paging00

15.  To inactivate the temporary paging space, the system must be rebooted:

     shutdown -Fr

16.  Remove the temporary paging space:

     rmps paging00

17.  If the dump device was changed in step 9, it must be reset to look at 
     the new,  smaller hd6:

     sysdumpdev -P -p /dev/hd6

     or:

     sysdumpdev -P -s /dev/hd6

     depending on whether it is the primary or secondary dump device.