Take a look at http://www.ris.ripe.net/ipv6-updates/all/ (or any of the individual RRC's plots) and you'll see a certain periodicity about the graph. It seems that the RRD is only getting about half the data: 5 minutes and 35 minutes past each hour: weesp runs the "collect" script and pushes the raw files to halfweg. 0 minutes past each hour: halfweg runs the "ipv6-updates/update.sh" script looking for files from the "previous hour" (date -d "1 hour ago" +"%Y%m%d.%H"). However, at this time, only files up to the last run of "collect" (25 minutes earlier) are present - YYYYMMDD.HH00 to YYYYMMDD.HH35. Next time "update.sh" runs, an hour later, it again only looks at files from the previous hour (and not the missing files from the hour before that). Data from the last 25 minutes of each hour are never inserted into the RRD. A solution to this would be for risops@halfweg's crontab to run the "ipv6-updates/update.sh" sufficiently long after 5 minutes past the hour for the "collect" run on weesp to have pushed all the previous hour's files to halfweg. Thoughts? James