Configuring Information Stores

Transaction Log Drives

You can significantly improve the performance and fault tolerance of an Exchange server by placing its transaction log files on separate drives. Because these files are critical to the operation of a server, the drives should be protected against failure, ideally by hardware mirroring using redundant array of independent drives (RAID).

For optimum performance, each set of transaction logs should be placed on a separate drive. Because each storage group has its own set of transaction logs, the number of dedicated transaction log drives for your server should equal the number of planned storage groups. Although it is possible to have multiple sets of transaction logs on the same drive, server performance may decline significantly.

Tip   Distribute your database drives across many small computer system interface (SCSI) channels or controllers, but configure them as a single logical drive to minimize SCSI bus saturation.

An example disk configuration is as follows:

Note   The file system for transaction log drives should always be formatted for NTFS.