Hi Stefan, thanks for your answer. My VirtualCenter have the same parameters as your screenshot. I've been doing some tests and changing the "interval duration" only affects the number of samples that are inserted in the database not when they are inserted. For example:
With "Interval duration" = 5 -> 1 sample inserted every 5 minutes
With "Interval duration" = 1 -> 5 samples (one for each minute that has passed chronologically) inserted every 5 minutes
I want the insertion to happen each minute (not the 5 in one go).
Regards