What Are Appropriate Sizes For Linux Partitions?

stuyman asks: "I'm amazed that I haven't been able to find a good source of information on this sort of subject, but it seems that all anyone ever says is that it needs to be determined based on "certain factors" on an individual basis. No one ever says how to evaluate those factors. I need to set up a whole bunch of new Linux servers. How big should the partitions be? Anyone have any formulas or ideas? I'm open to superstitions, too (heads, root is 300, tails it's 60). Some quick details about the setup: We've got a 20.5 gig HD and we want to have separate partitions for /, /var, /usr, /usr/local (maybe), /home, /opt, and /tmp, as well as a sufficient amount of swap. The servers will run RedHat 6.2 with Apache stronghold, and will also need X installed. We're currently leaning towards having huge /usr and /usr/local, with about 2 gigs for var. Also, how much /var would one suggest for a syslogd server that'd be serving logs for 50+ boxen? (running mostly RH or SunOS) Awaiting this thread eagerly..."