The information contained in this document concerns reducing the size of the
/var or /tmp file system.
This document applies to all supported releases of AIX Version 4.
The product documentation library is also available:
The following steps reduce the size of the /var or /tmp file system in all supported releases of AIX Version 4. If either file system on your machine is 8192KB in size or smaller, you probably should not reduce it. The default size of the /var file system (on installation) is 4096KB, which fills up rather quickly. If you can afford the space, it is better to have /var be 8192KB total. The default size of the /tmp file system (upon installation) is 8192KB.
NOTE: Back up the data before proceeding. If you have a tape drive connected to your system, this can be achieved by executing the following sequence of commands on either /var or /tmp:
cd / tar -cvf /dev/rmt0 /var
/dev/rmt0 can be replaced with /dev/fd0 or the full path of a directory NOT in the same file system.
Please refer to your system user's or installation and service guide for specific IPL procedures related to your type and model of your system. Additionally, the document titled "Booting in Service Mode", available at http://techsupport.services.ibm.com/rs6k/techbrowse, has specific procedures for most types of systems.
The bootable media can be any ONE of the following:
Follow the screen prompts or icons to the Welcome to Base OS menu.
The next screen displays a warning that indicates you will not be able to return to the Base OS menu without rebooting.
The next screen displays information about all volume groups on the system.
If you get errors from the preceding option, do not continue with this procedure. Correct the problem causing the error. If you need assistance correcting the problem causing the error, contact one of the following:
If no errors occur, proceed with the following steps.
mklv -y hd9var rootvg [x] (for /var)
mklv -y hd3 rootvg [x] (for /tmp)
x is the number of logical partitions you want to allocate. If your rootvg volume group has a PP size of 4MB, and you want the /var file system to be a total of 8MB in size, then x would be 2. For example:
mklv -y hd9var rootvg 2
This command makes a logical volume hd9var of size 8MB (two 4MB partitions) in the rootvg volume group.
NOTE: The hd3 is the logical volume name used for the /tmp file system, and hd9var is the logical volume name used for /var. These names must be used if you wish to maintain your AIX system in an IBM supported state.
crfs -v jfs -d hd9var -m /var -a check=false -a free=false -a vol=/var
NOTE: Substitute hd3 for hd9var and /tmp for /var if needed. Refer to the section Example of /etc/filesystems for the different attributes required for these filesystems.
mount /var (OR mount /tmp)
TERM=hft export TERM
vi -c "set dir=/" /etc/filesystems
If you have not been recreating /tmp, execute:
Skip down to the stanza for either /var or /tmp. Within that stanza, go to the line that says mount = false and change the word false to automatic. Save the file.
chmod g-s /var chmod 755 /var chown bin.bin /var or chmod g-s /tmp chmod 1777 /tmp chown bin.bin /tmp
cd / tar -xvf /dev/rmt0
dev = /dev/hd9var vfs = jfs log = /dev/hd8 mount = automatic check = false type = bootfs vol = /var free = false
dev = /dev/hd3 vfs = jfs log = /dev/hd8 mount = automatic check = false vol = /tmp free = false
[ Doc Ref: 90605221114602 Publish Date: Jan. 17, 2001 4FAX Ref: 7204 ]