Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!mcnc!uvaarpa!murdoch!news
From: lab3e@landau5.phys.virginia.edu (Louis A. Bloomfield)
Newsgroups: comp.unix.aix
Subject: Compressing /usr Filesystem
Message-ID: <1991Jan2.135319.18477@murdoch.acc.Virginia.EDU>
Date: 2 Jan 91 13:53:19 GMT
References: <295@bria.AIX>
Sender: news@murdoch.acc.Virginia.EDU
Organization: University of Virginia
Lines: 30

A number of individuals have noted difficulty in removing /usr in order
to compress that filesystem.  The reason /usr won't umount is that the
Korn Shell is holding on to it.  To compress /usr, I have done the following:

1) saved /usr to disk or tape and made a copy of /etc/filesystems
2) set root to use csh (not ksh) and logged in as root
3) telinit 1
4) killall -
5) umount /usr    (It will actually umount successfully)
6) destroyed /usr (the filesystem and logical volume)
7) recreated /usr (the logical volume and filesystem)
8) restored /usr from disk or tape
9) restored /etc/filesystems from the copy
10) telinit 2 (or rebooted)

It scared me to death, but it worked.  I don't know if saving the
/etc/filesystems was important, but I wanted to be sure that the
order of filesystems in that file didn't cause trouble.  One note of
warning:  once I had umounted /usr, SMIT stopped working well.  After
you umount /usr, try smit.  If you find that it is still usable,
you can proceed.  If not, learn how to do steps 6 to 8 from the csh.
I succeeded in using smit by typing cntl-N and cntl-P even though it
had great difficulty talking to my screen and keyboard.  I suppose it
lost some obvious terminal information file that I don't know about.
Anyway, my /usr directory is now just the right size and I hope never
to compress it again.

Louis A. Bloomfield                 LAB3E@VIRGINIA.EDU
Department of Physics               LAB3E@VIRGINIA.BITNET
University of Virginia