Thursday, April 19, 2007

What Causes Exchange Disk I/O

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.


For example, if you have a computer running Exchange 2003 that contains one storage group with five databases, you should configure the following separate, physical RAID arrays:

  • 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 (forums (Blog)

Http:// (Blog)

Http:// (Blog)

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