This is one of the hardest questions that faces server administrators. How big do you actually size your page file if you don’t just follow the 1.5 rule. Clint Huffman has a great post over on his blog on how you figure out what your page file should be. I can by no means cover it as well as he does so I encourage you to stop by the link below and read his post on how you should set your page file. He also includes a link from technet on how to troubleshoot memory issues. The link is a presentation that David Solomon did. The webcast is about 90 minutes long but I promise it will take you a lot longer to get through it. Either that or you will have to watch it multiple times to catch all the facts that are in the webcast. Going through this webcast pushed me over the edge to buy the latest Windows Internals book. It is focused on Windows Server 2008 and Vista, but there is allot of general knowledge that can be applied to all Microsoft operating systems.
Clint’s Post On Page File
http://blogs.technet.com/clinth/archive/2009/09/03/the-case-of-the-enormous-page-file.aspx
David Solomon’s Webcast
http://www.microsoft.com/emea/spotlight/sessionh.aspx?videoid=64&PUID=0003BFFD88341992
Windows Internals 5 On Amazon
http://www.amazon.com/Windows%C2%AE-Internals-Including-Windows-PRO-Developer/dp/0735625301