Summary: this document describes difference in setting in Hyper Historian Logger. Storage Limit Condition, Actions are described.
Hyper Historian Logger - Delete Old Files
First test was done using the 'Delete Old Files' option. Condition is Minimum Time Extent and Minimum Total Size.
Time is set to 1 hour and the size to 10MB.
Conditions are checked every 1 minute.
After the Size exceeds 10Mb, the file is still in the folder, because Minimum Time Extent is not reached yet.
After 1 hour, the file is deleted and new file is created
Hyper Historian Logger - Archive Old Files
Now Delete Old FIles was switched into Archive Old FIles.
The archived ones are located by default in the same folder as the new ones. Now, both files are kept in this folder and won't be deleted.
The application has access to both files, including those that have been archived. The fact that a file is already archived does not mean that we cannot display the data on the graph or in the table.
For the 'current' files, the SCADA/application has continuous access (as if they were kept open all the time and ready for data reading).
However, for the archived files, it needs to query the historian to access them. If we display many archieved historian data it might cause some delays in our diplay.