Performance issues with no reason?

[dignus]

Hi all,

We've using zabbix for years now, but since a while we're seeing some weird stuff.

First some stats:
Hosts: 373
Items: 19474
Triggers: 7126
Required performance: 307/sec

In the interface we're seeing the famous dots in the graphs, pointing to not enough resources available. But when I look at the box itself it has a load average of 0.2, no I/O wait on the CPU, mysql processlist usually empty and a sh*tload of free memory available. I've been looking at MySQL tuning, but I can't do anything besides I already did.

Is there a way I can verify whether the data in the graphs is actually in the DB? In other words: get the raw output of latest data? Or the query it used to generate the graph?

For future notice, hardware specs:
2 x Xeon E5620 quad core @ 2.4
96 GB RAM
4 x 300 GB SAS II 15k RPM in RAID 10

Another interesting note: look at these 2 screenies: https://jkooijman.admin.cloud.nl/nr1.png & https://jkooijman.admin.cloud.nl/nr2.png. Same pattern, but look at the timestamps. one graph contains data the other doesn't show.

[tchjts1]

What version of Zabbix are you using? If you are at 1.8.5 or above, follow this post (bottom half of it anyway) regarding internal Zabbix performance.

https://www.zabbix.com/forum/showthread.php?t=41219

It may be as simple as going into your zabbix_server.conf and increasing the Timeout= value from the default of 3 to something like 10.


Also, to see the "raw data" in Latest Data tab, pick an item and all the way out to the left, click on graph. Then, use the dropdown boxes at the top right to select "Values"