Topic Last Modified: 2006-08-18

The Microsoft® Exchange Server Analyzer Tool has determined that your disk array controller does not have the write-back cache set correctly for the drives that host the transaction logs.

It is recommended that you enable the write-back cache to 100 percent on your array controller for all drives that host transaction logs. Transaction logs are rarely read from. The more write speed that is available to a transaction log drive, the better a server that is running Exchange Server will perform.

To correct this warning

For more information about how to configure Exchange server hard disks, see Microsoft Knowledge Base article 188589, "Exchange DB and caching hard disks and controllers," (