Below is great table to keep memorize and understand about Exchange deals with I/O which is taken from TechNet.
Every time data is read from or written to Exchange, disk I/O is generated. Understanding the sources of Exchange disk I/O helps you plan and configure your disk subsystem in a way that maximizes performance. When considering the sources of Exchange disk I/O, focus most of your attention on the I/O behavior that is generated during log file and database file access.
- C:\ - System volume, operating system, Exchange system files - RAID-1 (direct-attached storage, not SAN)
- D:\ - Page file - RAID-1 (direct-attached storage, not SAN)
- E:\ - SMTP and MTA queues - RAID-1+0 (SAN)
- F:\ - Log files from storage group 1 - RAID-1 (SAN)
- G:\ - Databases from storage group 1 - RAID-1+0 (SAN
I will add some more information and tips optimizing performance on Exchange servers on the planning and installation
Meet with Jim McBee (one of the best in Exchange)
Exchange 2007 Roadshow - Washington DC