The SQLIOSim knowledge base article outlines the various configuration files in detail. http://support.microsoft.com/kb/231619 - How to use the SQLIOSim utility to simulate SQL Server activity on a disk subsystem.
I still get inquires about what should I run by default. My answer is: Use the default.config.ini but update the following.
- Number of iterations to 5 ore more
- Testing iteration duration to 300 seconds or more. I like 600 myself.
- File(s) - Make sure the names, paths match that of the problem system and you want the size to be larger than the hardware cache. (NOTE: Don't specify the SQL Server .MDF or .LDF files or it will erase the database data)
SQL Server Principal Escalation Engineers