Space on a rack available for rackmount servers.
Found on http://www.glossarycentral.com/website_hosting/rackspace.html


Rackspace Inc. is a managed cloud computing company based in Windcrest, Texas, USA, a suburb of San Antonio, Texas. The company also has offices in Australia, the United Kingdom, Switzerland, Israel, The Netherlands, India, and Hong Kong, and data centers operating in Texas, Illinois, Virginia, the United Kingdom, Australia, and Hong Kong. The com...
Found on http://en.wikipedia.org/wiki/Rackspace
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