Use Jetstress 2010 Beta to verify performance and stability of a disk subsystem prior to putting an Exchange 2010 server into production. Jetstress helps verify disk performance by simulating Exchange disk Input/Output (I/O) load. Specifically, Jetstress simulates the Exchange database and log file loads produced by a specific number of users. You use Performance Monitor, Event Viewer, and ESEUTIL in conjunction with Jetstress to verify that your disk subsystem meets or exceeds the performance criteria you establish. After a successful completion of the Jetstress Disk Performance and Stress Tests in a non-production environment, you’ll have ensured that Exchange 2010 disk subsystem is adequately sized (in terms of performance criteria you establish) for the user count and user profiles you’ve established. Its highly recommended that the Jetstress user read through the tool documentation before using the tool. This version’s intended for Microsoft Exchange 2010 servers. The I/O profile is still subject to change until official release of Microsoft Exchange 2010 Server. Future versions will provide compatibility with Microsoft Exchange 2007.
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Source:→ Exchange blog