The /var/log/ directory on the first server I checked was 100MB, so check if you've got an excess of logs first. I'd take a copy as well in case it helps you track down the cause. Deleting the .gz logs won't cause you any trouble though - I've done it many times.
They will come back of course, so you might have to keep an eye on them. Most of my servers at 6.2 level have several hundred MB available though, so you may have something else taking up space.
The times I've come across this problem, there's normally a simple reason - someone trying to export a VM to /root for example. It's really a matter of finding the large directories (du -shx /*
)and comparing to a server without the problem.