Microsoft SQLIO (SQL Server Input Output Generation Tool) - is a tool provided by Microsoft which can also be used to determine the I/O capacity of a given configuration

Sqlio is a disk workload generator that is designed to simulate some aspects of the I/O workload of Microsoft SQL Server. It tests the Input/Output capacity of a disk subsystem. It is good practice to benchmark the I/O subsystem using an I/O stress tool to determine the hardware’s capacity and ensure the system is tuned for optimal performance.