AIX

The /tmp is 100% full, I found there are the following big files/directory:

1301500 syslog.out.58
166692 vac
158552 install.dir.2928686
158552 install.dir.2236636
110980 install.dir.2887698

/tmp/vac have some files like :

.toc vacpp.msg.JA_JP.cmp.core.06.00.0000.0001.bff xlopt.tools.01.03.0002.0000.bff
memdbg.adt.04.04.0003.0001.bff vacpp.msg.Ja_JP.cmp.core.06.00.0000.0001.bff xlopt.tools.01.03.0002.0006.bff
memdbg.aix50.adt.04.04.0003.0004.bff vacpp.msg.ZH_CN.cmp.core.06.00.0000.0001.bff xlsmp.aix50.rte.01.06.0000.0000.bff
vac.C.06.00.0000.0016.bff vacpp.msg.en_US.cmp.core.06.00.0000.0008.bff xlsmp.aix50.rte.01.06.0000.0003.bff


Which files or directory I can delete?

The "*bff" files are "Backup-File-Format" and are installable OS-packages. These are probably on your installation medium (CD, DVD, etc.) or you have downloaded updates from IBMs Fixdist Central. They should not reside in /tmp anyways but be kept in an archive on your NIM Server (if you have one) or somewhere, where you store all your OS-updates (you do store them somewhere, yes?).

As a rule of thumb: files in /tmp are in /tmp and nowhere else because they are expendable - whoever puts something in /tmp should be well aware that /tmp is TEMPORARY - expect your stuff to be there in 20 minutes from now for sure, tomorrow most likely, in a week probably not any more and in a month surely not.

Delete whatever you want, it should not bother anyone. If it does you will have to change the attitude of your users, not the way /tmp is handled.

bakunin

For example don't expect contents of /tmp to survive a reboot.

Agreed...it is "improper" to use /tmp as a source for installation images (usually "/usr/sys/inst.images" is used), nor is it appropriate for long-running logs (like the syslog, which should go in "/var/adm/ras"). Letting /tmp fill up is a Very Bad Thing.

However, I would not just delete the contents of /tmp willy-nilly. There are some programs that use it for, well, temporary space. So doing a mass-deletion should be limited to files/dirs that are old (i.e., 30 days).

There should always be some sort of /tmp cleanup that is automated, such as "skulker".