Two schools of thought on this...
Old School says you should do a graceful restart of the server every X days/months, because even if everything seems to be working there may be runaway and/or zombie processes eating resources and a reboot will clean them out.
New School says the only time to reboot an xNix box is when you have to (e.g. kernel rebuild, etc).
Who's right? Probably both. LOL
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