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Top Document: comp.unix.aix Frequently Asked Questions (Part 3 of 5) Previous Document: 1.700: Free LVM lecture slides. Next Document: 1.702: How do I make a filesystem larger than 2Gb? See reader questions & answers on this topic! - Help others by sharing your knowledge
FOR AIX 3.1
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1) Make a backup of /usr
find /usr -print | backup -ivf /dev/rmt0 (or appropriate device)
2) shutdown to maintenance mode
shutdown -Fm
3) export LANG=C
4) remove the filesystem and the logical volume
ignore an error about the "dspmsg" command not found
umount /usr
rmfs /usr
5) make a new logical volume hd2 and place it on rootvg with desired size
mklv -yhd2 -a'e' rootvg NNN
where NNN is the number of 4 meg partitions
6) create a filesystem on /dev/hd2
crfs -vjfs -dhd2 -m'/usr' -Ayes -p'rw'
7) mount the new /usr filesystem and check it
/etc/mount /usr
df -v
8) restore from the tape; system won't reboot otherwise
restore -xvf/dev/rmt0
9) Sync and reboot the system; you now have a smaller /usr filesystem
FOR AIX 3.2
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0) Experiences posted to comp.unix.aix lead me to suggest that
many administrators find the following piece of information
useful after completing this procedure. I thought some of you
might like to read it BEFORE getting yourself into this
predicament.
Call 1-800-IBM-4FAX and request document 2503 dated 1/26/94.
Title is "How to recover if all files are owned by root after
restoration from a mksysb tape".
1) Remove any unneeded files from /usr.
2) Make sure all filesystems in the root volume group are mounted. If
not, they will not be included in the re-installed system.
3) Type mkszfile. This will create /.fs.size that contains a list of
the active filesystems in the root volume group that will be
included in the installation procedure.
4) Edit .fs.size. Change the size of /usr to what you want.
Example: This .fs.size file shows /usr to be 40MB.
rootvg 4 hd2 /usr 10 40 jfs
The 10 is the number of physical partitions for the filesystem and
the 40 is 40 MB. Most systems have a physical partition size of 4 MB.
Therefore, the second number (40) will always be 4 times the
previous number (10). Note, however, that a model 320 with a 120 MB
drive will have a physical partition size of only 2 MB, and the
total MB is twice the number of physical partitions. The first
number (4) in the .fs.size file represents the PP size.
If you want to reduce the size of /usr from 40 MB to 32 MB, edit the
/usr entry to:
rootvg 4 hd2 /usr 8 32 jfs
IMPORTANT: Make sure that you DO NOT enter a value which is less
than the size of the filesystem required to contain the current
data. Doing so will cause the re-installation procedure to fail.
5) chdev -l rmt0 -a block=512 -T
6) Unmount all filesystems that are NOT in the root volume group.
7) Varyoff all user-defined volume groups, if any
varyoffvg VGname
8) Export the user-defined volume groups, if any
exportvg VGname
9) With a tape in the tape drive, type
mksysb /dev/rmt0
This will do a complete system backup, which will include
information (in the .fs.size file) for the installation procedure
on how large the filesystems are to be created.
10) Follow the instructions in the Installation Kit under "How to
Install and perform maintenance from Diskettes" (reportedly now
called "BOS Installation from a System Backup") using the
diskettes and tape that you created in the previous steps.
[ pre AIX 325: DO NOT select the option "Reinstall AIX with
Current System Settings". Instead use "Install AIX with Current
System Settings" for the logical volume size changes to take affect. ]
[ w/ AIX 325: Select "Install from a mksysb image" ]
11) When the installation is complete, you may then import any
user-defined volume groups.
importvg -y VGname PVname
where "VGname" is the name of the volume group, and "PVname" is
the name of any one of the physical volumes in the volume group.
12) Varyon your user-defined volume groups
varyonvg VGname
The reduction of the filesystems is now complete.
COMMERCIAL OPTION
-----------------
There are also commercial tools availible to help you do this more
conviently. I know of one vendor that can be reached at info@compunix.com
User Contributions:Comment about this article, ask questions, or add new information about this topic:Top Document: comp.unix.aix Frequently Asked Questions (Part 3 of 5) Previous Document: 1.700: Free LVM lecture slides. Next Document: 1.702: How do I make a filesystem larger than 2Gb? Part1 - Part2 - Part3 - Part4 - Part5 - Single Page [ Usenet FAQs | Web FAQs | Documents | RFC Index ] Send corrections/additions to the FAQ Maintainer: bofh@mail.teleweb.pt (Jose Pina Coelho)
Last Update March 27 2014 @ 02:11 PM
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