Emerson Exchange 365

Hi All,

     version : DeltaV 9.3

     I got the Alarm  the message is   Event Chronicle : Disk Space Low

     First  time , I am scare and set the current Event History Data Set  Size Target: 0 Mbytes

    and delete the History Data.

    But in days, I get the same alarms. This time I check the Hard Disk is about 100GB free and  my active Event History Data Set  Target :400 Mbytes

    As the picture (Event Chronicle administrator) shows,  my active/current data is about 172MB
    free space is about 227MB 

   Why DV trigger  Disk Space Low alarm ?　Please help to point how to find root cause or how to obviate it .

Thanks,

YL