Everything related to building large storages using Linux, open source and off the shelf components.
Overview of the components and terminology
Discussions and forums
Petabytes on a budget: How to build cheap cloud storage
Custom Electronic Enclosures for Engineers and Designers
Newegg.com - 4U Rackmount Case, Rackmount Server, 4U, 2U, 1U, Server Case, Rackmount Case, 4U Rackmount Chassis