http://www.extremelinux.org/
http://www.geocities.co.jp/HeartLand-Namiki/1720/scrap001.html
http://linux.ascii24.com/linux/news/column/200/1999/11/27/328352-001.html
http://www.zdnet.co.jp/pcweek/archives/981130/981130p0602.html
http://www.cssi.co.jp/product/linux/raikoh.cluster/raikoh%20cluster%20system.htm