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The Double-Take service generates a log file to gather alerts, which are notification, warning, and error messages. The log file consists of a base name, a series number, and an extension. The base name is dtlog and the extension is .dtl. The series number ranges from 1 to 999. For example, Double-Take Availability begins logging messages to dtlog1.dtl. When this file reaches its maximum size, the next log file will be written to dtlog2.dtl. As long as log messages continue to be written, files dtlog3.dtl, dtlog4.dtl, and dtlog5.dtl will be opened and filled. When the maximum number of files is reached, which by default is 5, the oldest file is deleted. For example, when dtlog6.dtl is created, dtlog1.dtl is deleted and when dtlog7.dtl is created, dtlog2.dtl is deleted. When file dtlog999.dtl is created and filled, dtlog1.dtl will be re-created and Double-Take Availability will continue writing log messages to that file. In the event that a file cannot be removed, its number will be kept in the list, and on each successive file remove, the log writer will attempt to remove the oldest file in the list.