Jetstress uses Exchange 2003 SP1 ESE Performance counters for NAS storage sub-system.

Jetstress enables "Use storage volumes on NAS" when you Exchange 2003 SP1 ESE binaries (of which must be later than or equal to 6.5.7104.0)

Drive letters used for the storage of Exchange 2003 database and log files are not presented as physical or logical disks; instead, they are presented as drive letters associated with a network file share. To measure performance of your network-attached storage system, you can enable the extended ESE performance counters available in Exchange 2003 Service Pack 1 (SP1) and later.

References:

• How to Enable Extended ESE Performance Counters https://www.microsoft.com/technet/prodtechnol/exchange/guides/StoragePerformance/3eda2cda-2045-4344-b9f9-1819eabacadd.mspx
• Optimizing Your Storage Architecture https://www.microsoft.com/technet/prodtechnol/exchange/guides/StoragePerformance/2f700b72-5596-4e33-8f6c-3345608f6d31.mspx

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