2.x upgrade - network monitoring graphs are missing

You can try this to reset your graphs. It will take some time to create new data points. You can click on refresh to see that it is working.

rm -r /var/lib/rrdcached/db/localhost
rm /var/lib/rrdcached/journal/*
service collectd restart
service rrdcached restart

Look in /var/lib/rrdcached/db/localhost/interface-ethx (x is whatever interfacec you are using)

Do you see a recent time on the files in that folder??? We are checking to see if the files are being written to recently.

Are the other graphs working normally???

Are you using a static ip or dhcp???

Your graphs should be working for network if you are seeing new time stamps..

Did you clear your browser cache??? Did you try another browser?

Hmm... we wait and see if Volker finds something.

I can replicate the issue. Problem appeared at the upgrade to 2.x, and it's only limited to the ETH0 graphs. Data is still being collected:

root@openmediavault:/var/lib/rrdcached/db/localhost/interface-eth0# ls -lsa
total 884
  4 drwxr-xr-x  2 root root   4096 Sep 18  2014 .
  4 drwxr-xr-x 24 root root   4096 Jul  3 00:05 ..
292 -rw-r--r--  1 root root 295232 Jul  7 00:11 if_errors.rrd
292 -rw-r--r--  1 root root 295232 Jul  7 00:11 if_octets.rrd
292 -rw-r--r--  1 root root 295232 Jul  7 00:11 if_packets.rrd

It's just the graphs not being propery displayed.

For instance, the memory hourly graph works:

<img src="rrd.php?name=memory-hour.png&amp;time=1436217329828" alt="RRD graph - by hour">

But the ETH0 doesn't:

<img src="rrd.php?name=interface-eth0-hour.png&amp;time=1436217250759" alt="RRD graph - by hour">

Why'd you bother with that, when obviously it's an issue of the graph generating script not referencing existing data correctly You could even disable the NIC and the script should still produce relevant graphs based on already collected history.

Same here, no network graphs!!!

After upgrading to omv 2.1 my eth0 graphs don't work.

PS: I have a raspberry pi 2 box.

Mine is now fixed -> Disabling and re-enabling the monitor feature fixed it for me!!!

Same here!
After upgrading to OMV 2.x no Network-Graphs!

A lot of times I see people where their graphs data is corrupted. These are best instructions I give to reset graphs with corrupted database.

rm -r /var/lib/rrdcached/db/localhost
rm /var/lib/rrdcached/journal/*
service collectd restart
service rrdcached restart

Just to let you know: after upgrading from 1.9 to 2.1 (without any incident) I had the same incident with the network interface statistics.
No statictics were displayed anymore for my network adapter. The other indicators were fine (CPU, disk, load, memory)

After some investigation I found /usr/sbin/omv-mkgraph, which had an 'error' in the code:

# Plugin: interface
...
for devicename in ; do

After adding a fake VLAN and deleting the VLAN the file omv-mkgraph was modified with this code:

# Plugin: interface
...
for devicename in eth0 ; do

This fixed the issue!