AIX 5L Problem Determination - IBM Redbooks

9.4.3 A full file system
uid=0(root) gid=0(system) groups=2(bin),3(sys),7(security),8(cron),10(audit)
# su ostach
$ id
uid=201(ostach) gid=1(staff)
$ env
LOGIN=ostach
LOGNAME=root
MAIL=/usr/spool/mail/root
USER=root
R_PORT=49213
HOME=/
PWD=/
Each time the su command is run, an entry is recorded in the /var/adm/sulog file.
The /var/adm/sulog file records the following information: Date, time, system
name, and login name. The /var/adm/sulog file also records whether the login
attempt was successful: a plus sign (+) indicates a successful login, and a minus
sign (-) indicates an unsuccessful login.
# cat /var/adm/sulog
SU 06/30 09:36 + pts/1 root-thomasc
SU 06/30 10:25 + pts/3 root-thomasc
SU 07/18 11:56 + pts/3 root-ostach
SU 07/18 13:05 + pts/3 root-ostach
SU 07/18 13:05 - pts/3 ostach-root
SU 07/18 13:06 - pts/3 ostach-thomasc
When a file system on your system becomes full, it can cause logins to the
system (using telnet), a directly connected TTY, or the system console to fail.
The following message is typically displayed:
telnet problem 004 - 004 you must exect "login from the lowest login shell"
Or, on the system console, the following error message may be displayed:
3004-004 you must 'exec' login from the lowest login shell
Check that your file systems are not full, especially the / (root) file system. Use
the df command to verify the status of free disk space on your file systems. If a
file system is full, enlarge the file system using the chfs command.
If your file systems are not full, check to see if the following files are okay:
► /etc/utmp
► /etc/security/limits
210 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques