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…

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