Filesystem Full

In our shop we have to run a batch cycle. Every so often while we are running batch we get a filesystem full situation that causes batch to stop or slow down. Anyway, the practiced procedure is to look for large files and zip them. This takes a lot of time. We are in a sun solaris environment. What the best way to reduce the size of a filesystem and the quickest? Thanks in advance.

Either delete things, compress things, or move things somewhere else. And none of these unless you're sure the files in question are safe to do so. There's nothing mysterious about it, really.