Weekly graphs not working if item refreshed every 600sec

[Calimero]

Hi,

I've noticed that if an item (vfs.fs.size[/,pfree] in my case) is refreshed every 600sec, graphs (simple or 'advanced') will show no data if I choose a period of more than 3 days on a 1233x311 pixel graph.

There's a strange relationship that includes: item refresh rate, graph width (in pixels) and time period.

Behaviour occurs on Zabbix 1.1.6 and 1.4.2.

Ex:
Item interval : 600sec
Graph period: 3 days
Graph width : 1223px (fullscreen)
==> OK

Item interval : 600sec
Graph period: 3 days and 4 hours
Graph width : 1223px (fullscreen)
==> KO: graph is created but it shows no data

Item interval : 600sec
Graph period: 3 days
Graph width : 776px (smaller Firefox window)
==> KO: graph is created but it shows no data

Item interval : 300sec
Graph period: 3 days
Graph width : 1223px (fullscreen)
==> OK

Item interval : 300sec
Graph period: 3 days and 4 hours
Graph width : 1223px (fullscreen)
==> OK

Item interval : 300sec
Graph period: 3 days
Graph width : 776px (smaller Firefox window)
==> OK

I can post screenshots if needed (I need to resize them as there is a 800px limit on the forum).
I'll try to see what the threshold is in terms of refresh interval (500sec ? 400sec ?).

[Calimero]

Actually even with a 300 sec refresh interval there are still some weird problems.

Item refresh interval : 300sec
Graph width: 1223px (full screen)
Graph period: 1 day ==> OK
Graph period: 2 days ==> OK
Graph period: 3 days ==> OK
Graph period: 4 days ==> KO --> no data
Graph period: 5 days ==> OK

Same on zabbix 1.1.6 and 1.4.2.

[holtet]

I have also experienced similar things in 1.4.1, where graphs behave differently depending on graph size (pixels) and timeperiod. Some times the graph is empty, other times it looks like all data is "squeezed together" in the rightmost 1/10th of the graph. I'd be happy to supply screenshots or data dumps if needed. Unfortunately I'm not a php programmer, so I haven't looked at the code.