http://blogs.technet.com/beatrice/archive/2007/04/20/sqliosim-for-dummies.aspxSQLIOSim is a great utility to perform tests on disk subsystems. These tests simulate read, write, checkpoint, backup, sort, and read-ahead activities for Microsoft SQL Server. The SQLIOSim utility has been upgraded from the SQLIOStress utility and moreit-ITCommunityServer 2.1 SP1 (Build: 61025.2)