Hi Morten
Spot on - it was the carbon-cache storage schema. During installation of Nav, I started Nav - unfortunately before configuring Graphite in accordance with your first link. Initially I skipped your second link in my search for the error, as I was not seeing gaps but was missing the graphs entirely.
Thank you very much for your help.
For the archives:
I could confirm the problem with whisper-info showing the secondsPerPoint in Archive 0 set at 60, not the expected 300
root@nav:~# whisper-info /var/lib/graphite/whisper/nav/devices/192_168_0_10/ports/24/ifInOctets.wsp maxRetention: 51840000 xFilesFactor: 0.5 aggregationMethod: last fileSize: 45568
Archive 0 retention: 604800 secondsPerPoint: 300 <- was wrongly set to 60 points: 2016 size: 24192 offset: 64
To get back to a clean slate i did the following:
** WARNING -- WILL REMOVE ALL GRAPHITE + NAV-DATA **
/etc/init.d/nav stop; /etc/init.d/carbon-cache stop; /etc/init.d/apache2 stop rm -rf /var/lib/graphite/whisper/* rm /var/lib/graphite/graphite.db python /usr/share/pyshared/graphite/manage.py syncdb chown _graphite:_graphite /var/lib/graphite/graphite.db chmod o-r /var/lib/graphite/graphite.db su - postgres -c 'psql nav -c "truncate device, vlan, netbios cascade;"' /etc/init.d/carbon-cache start; /etc/init.d/nav start; /etc/init.d/apache2 start
Which I found in the nav-users mailing list [1]
[1] http://nav-users.itea.ntnu.narkive.com/wlPupwV8/setting-up-nav-from-scratch-...