For threshold monitoring, users must prepare disk space on the administrative server to save condition reports of the threshold monitoring alarm notification log. About 4 MB is required. Make sure that the server has sufficient disk space. This software has a functionality for deleting condition report data whose set retention duration days have passed. Data stored for 366 days or more is automatically deleted. Change this retention duration setting as required. For details, see Alarm Delete Setting in the "B.10.6 Threshold monitoring dialog functions".