There are number of queries in your post which can't easily be answered with a single response.Where are the process crash logs kept? I'm wanting to delete or truncate old ones, and don't know where to find them. I've looked under /var/logs, but can't seem to determine which ones are for crashed processes. Thanks.
ls -alh /var/log
du -hx --all /var/log
[root@fen ~]# du -hxd1 /var/log