Microsoft Exchange Server 2007 can be deployed using an iSCSI storage solution. The basic requirements for storage for Exchange Server 2007 are that there is enough capacity, acceptable disk latency and response time, and enough disk throughput to meet service level agreements. The disk storage must be formatted using NTFS. Due to its 64-bit nature, increases in database cache and other improvements, transactional I/O requirements for Exchange Server 2007 have been reduced from previous releases.
Unlike previous versions of Exchange Server, network-attached storage is not supported in Exchange Server 2007. The only network-based storage transports supported for Exchange Server 2007 are iSCSI and Fibre Channel. In Microsoft test labs, iSCSI has been proven as a capable storage transport for Exchange Server. When high throughput is required, Microsoft recommends multiple network adapters and the use of MPIO.
Microsoft provides detailed deployment guides for Exchange Server 2007. These deployment guides include a major chapter on the planning of disk storage for Exchange Server and cover a variety of topics including storage capacity, storage technology, RAID selection, LUN sizes, storage validation (i.e. Jetstress), and more. These deployment guides are available at: http://www.microsoft.com/exchange. In addition, Microsoft has created the Exchange Solution Reviewed Program – Storage (ESRP), which is a Microsoft Exchange Server program designed to facilitate third-party storage testing and solution publishing for Exchange Server. Details about ESRP are available at: http://technet.microsoft.com/en-us/exchange/bb412164.aspx.