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Log files are created on the prod-cacti01-fra-de.geant.net server in the /tmp directory and start with the name BOD-Log. Check the contents of these files to see if any exceptions have been raised.
Within the cacti database, there is a table called bod_requests, by running the following query, it is possible to determine when the last graph that was created:
SELECT * FROM bod_requests
ORDER BY bod_request_datetime DESC;