SQL Server Hardware

From Red-Gate website you can download (for free) the ebook SQL Server Hardware written by Glenn Berry (@GlennAlanBerry).

This ebook will provide the fundamental knowledge and resources you need to make intelligent decisions about choice, and optimal installation and configuration, of SQL Server hardware, operating system and the SQL Server RDBMS. 

The full editorial review is available here.

This book cannot miss in your digital library! And obviously you can buy the paperback on Amazon.