AD Log File Free Space Monitor. Monitors that the free disk space on the drive that contains the AD log file is below the minimum acceptable level.
If the disk drive is full, Active Directory Domain Services will not function correctly and will cause failures for the services that use it.
Possible causes include the following:
The database size has grown through normal use of the directory.
Other files have been placed on this drive recently.
Relocate unnecessary files to an alternate volume or extend/replace the volume involved.