Tuesday, February 3, 2009

Exchange - How to Calculate Your Disk I/O Requirements

Calculating your disk I/O requirements ultimately allows you to optimize your disk subsystem to best support your users.
Your goal is to provide enough disk I/O performance (measured by the number of I/O operations per second [IOPS] that can be performed) with acceptable latency that allows for efficient Exchange functionality.
Calculating the IOPS per mailbox is a convenient way to measure the profile for a given server based on random database read/write I/O (transaction log I/O is not factored into this equation). The higher the IOPS per mailbox, the more aggressive the mailbox profile is in terms of disk usage.

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