HP-UX

/var/patches is certainly not needed.
Check if accessed the last 365 days with

Code:

find /var/patches -type f -atime -365 -exec ls -lu {} \;

"rotate" the /var/adm/syslog/syslog.log with

Code:

/sbin/init.d/syslogd stop
/sbin/init.d/syslogd start

On October 8th 2013, %used that reported by bdf command already reached 89%. I've escalated this issue to HP Call Center and they suggested to stop diagnostic service, delete or move files on /var/stm/logs/os and start diagnostic service. This help to reduce %used to 61%. They've also asked me to update Event Monitoring System (EMS) and onlinediag to the latest version to solve difference of disk usage that reported by bdf and du command. I decided not to update them since %used dropped to 61%.

On October 10th 2013, %used became 62% and the next day became 63%. This is not good because it keeps on growing again. Fortunately I've found "The /var filesystem is full." thread on HP forum (sorry, I can't post the URL due to my posts is < 5 but you can google it with "hp-ux /var full" keyword). So I downloaded lsof utility, installed it and ran it. Finally I've managed to found processes that were locking deleted files. After I killed them, %used dropped to 38%.

Many thanks for all.