Graph declines while item values are stable

[qix]

Hello all,

It's been a while since I last posted on this forum.
I've seem to run into a rather nasty bug in Zabbix 1.8.3, I don't know if somebody else has noticed the same behavior in there installment of Zabbix.

I don't really know how to exactly describe this problem either, so my search on the forum didn't yield any answers. Perhaps a picture is best to describe my problem :



The graph looks valid at first glance...however, have a look at the values at the left Y-axis. 4.98GB, 1B, 4.98GB, 1B, 4.98GB, 4.98GB, 1B. That's seem a bit awkward

When I look at the latest values screen and select a graph from there, I get roughly the same image:



When selecting values instead of graphs, they seem rather stable:

Timestamp Value
2010.Dec.13 09:54:53 5346623488
2010.Dec.13 09:54:23 5346627584
2010.Dec.13 09:53:53 5346623488
2010.Dec.13 09:53:24 5346631680
2010.Dec.13 09:52:54 5346631680
2010.Dec.13 09:52:23 5346627584
2010.Dec.13 09:51:53 5346619392
2010.Dec.13 09:51:23 5346631680
2010.Dec.13 09:50:54 5346631680
2010.Dec.13 09:50:24 5346627584
2010.Dec.13 09:49:53 5346643968
2010.Dec.13 09:49:23 5346643968
2010.Dec.13 09:48:53 5346635776
2010.Dec.13 09:48:23 5346643968
2010.Dec.13 09:47:53 5346648064
2010.Dec.13 09:47:23 5346648064
2010.Dec.13 09:46:53 5346648064
2010.Dec.13 09:46:23 5346643968
2010.Dec.13 09:45:53 5346648064
2010.Dec.13 09:45:24 5346648064
2010.Dec.13 09:44:54 5346648064
2010.Dec.13 09:44:23 5346643968
2010.Dec.13 09:43:53 5346648064
2010.Dec.13 09:43:24 5346648064
2010.Dec.13 09:42:54 5346652160
2010.Dec.13 09:42:23 5346652160
2010.Dec.13 09:41:53 5346656256
2010.Dec.13 09:41:23 5346656256
2010.Dec.13 09:40:53 5346656256
2010.Dec.13 09:40:23 5346652160
2010.Dec.13 09:39:53 5346672640
2010.Dec.13 09:39:24 5346680832
2010.Dec.13 09:38:53 5346680832
2010.Dec.13 09:38:23 5346676736
2010.Dec.13 09:37:55 5346680832
2010.Dec.13 09:37:23 5346668544
2010.Dec.13 09:36:53 5346680832
2010.Dec.13 09:36:23 5346680832
2010.Dec.13 09:35:53 5346684928
2010.Dec.13 09:35:23 5346689024
2010.Dec.13 09:34:53 5346689024
2010.Dec.13 09:34:23 5346684928
2010.Dec.13 09:33:54 5346689024
2010.Dec.13 09:33:24 5346689024
2010.Dec.13 09:32:53 5346689024
2010.Dec.13 09:32:23 5346684928
2010.Dec.13 09:31:53 5346693120
2010.Dec.13 09:31:24 5346693120
2010.Dec.13 09:30:54 5346693120
2010.Dec.13 09:30:24 5346693120
2010.Dec.13 09:29:54 5346701312

The Item and graph are part of a template, so I decided to see if another host that is using the same template is experiencing the same problems.

Here I also get an unexpected result:




Was this bug already described by someone else, or should I file it in the bug report system?
Or maybe I did something wrong??

Thanks for the help!

[qix]

*Bump*

I'd like some feedback on this. Disabling and reenabling the items didn't work.
Could there be something wrong with the item that is linked to the template?

[qix]

I added some more filesystem items on my hosts.

I'm experiencing this weird graphing behavior with all items vfs.fs.size[xxx,free] on Linux agents. The data seems fine when I open the last values.

I'll open a trouble ticket.

[qix]

ZBX-3311 filed.