Requirements and Best Practices for Log and Data Disk Mapping - Exchange

  • Article

The following validation messages can appear when Exchange Server data or log files are stored on the same disk or SAN volume that does not meet Exchange Server recommendations or requirements:

  • The Data and Log files must be mapped to separate volumes.
  • The Data, Log, Replica Data, and Replica Log files must be mapped to separate volumes.

Typically, one of these adjustment messages appears when you have modified a capacity model and chosen to store a combination of log files, data files, replica data, and replica log files on the same disk or SAN volume.

To make the required adjustments, use the following procedure:

Note

If you need to add additional disks to a server's hardware configuration, see the How to Modify a Computer or Device Configuration in the Hardware Editor topic.

Capacity Planner sizes storage for Exchange Server 2007 with the following criteria:

  • The log disk is sized for daily incremental and weekly full backups
  • The log disk is sized to allow the possibility of one backup failure, storing up to two days of log files
  • The log disk is sized to allow up to 5 percent of mailboxes to be moved between servers per week
  • Capacity Planner does not model a dedicated restore logical unit number (LUN).
  • The database drive is sized by adding 5 percent additional space for content indexing.
  • The Exchange Server 2007 database LUN capacity is sized with 20 percent safety overhead to account for other data that resides in the database that is not necessarily seen when calculating mailbox sizes and white space.

For more information about Exchange Server storage sizing, see Mailbox Server Storage Design on the Exchange Server TechCenter (https://go.microsoft.com/fwlink/?LinkId=101518).

The Exchange Server 2007 Mailbox Server Role Storage Requirements Calculator can help you to determine your storage requirements, such as I/O performance and capacity, and an optimal LUN layout based on a set of input factors. For more information about the storage calculator, including details about using it, see the Exchange 2007 Mailbox Server Role Storage Requirements Calculator on the Exchange Team blog (https://go.microsoft.com/fwlink/?LinkID=102593).

See Also

Tasks

How to Edit a Server Hardware Configuration or a Server Role in the Model Editor
Simulation Adjustment Tasks