One of the most frequent asked questions is defining storage configuration for Exchange 2010, what type of disk to go with and what type of RAID should be used. In reality most of these will depend upon your IT spending at the time when you plan or purchase this equipment.
If you are looking for advice or justification as what to purchase or perhaps doing design you might want to start reading links I am providing. Most of these generic questions have been answered in great details. Pay attention to “Best Practices” section the most (- :
Most of the best practices familiar but including DAG and redundancy less to worry if you go with redundant logs and databases.
Database size Supported up to 16 TB as best practice is less than 2 TB and provision 120% calculated maximum database size. In reality the major changes in ESE database and huge reduction on I/O requirements made Exchange more to give when it comes to databases. This is one of the primary reason Exchange even added “Archived database” out the box, since there is no longer I/O fear exist in a way in Exchange 2010 if you compare to previous versions. Still selecting fast disk should be preferred and give as much memory and CPU power to Exchange servers in reasonable measures and fallowing MS best practices as guidelines for each role and capacity.
Mailbox Storage Design Process
Understanding High Availability Factors
Understanding Storage Configuration
Understanding Exchange 2010 LUN Architecture
Exchange 2010 Mailbox Server Role Design Example