Specific trigger causes system load to "explode"

[welkin]

I have a problem with my zabbix server that a certain trigger causes the load to go up to ~5 while when just disabling this trigger the load drops to <0.5 again.

The expression is:

{Template OS Linux:vfs.fs.size[{#FSNAME},free].last(#0)}<1073741824 & {Template OS Linux:vfs.fs.size[{#FSNAME},pfree].last(#0)}<10

It's part of the filesystem discovery rule and there is a total of 347 triggers created.
The whole system becomes unusable when this trigger is enabled. The system is at ~70% user time with this trigger, so it's not io that's causing the load.

Any suggestions why this specific trigger might cause such problems?

Thanks in advance,

welkin

[Pada]

Are you using a 64-bit OS for your Zabbix server? Could you please tell us more about the Zabbix version and OS that you're using, as well as how frequently you're updating the space available items.

Secondly, what happens if you swap the expression around, so that it first checks the % free and then the amount in Bytes?

[welkin]

Hi Pada,

thanks for the Answer! My specs are like this:

Ubuntu 12.04.3 LTS 64Bit
Zabbix 2.0.8
Mysql: 5.5.32-0ubuntu0.12.04.1

The items are updated with a frequency of 60sec. History is kept 7 days and Trends 365 days.


I'll try to swap the expression, i just have to find out how to mass-update the triggers of the hosts since it doesn't seem to update the discovered triggers when i just change the template.

Regards,

welkin

[welkin]

Ok, i changed the expression to:

{Template OS Linux:vfs.fs.size[{#FSNAME},pfree].last(0)}<10 & {Template OS Linux:vfs.fs.size[{#FSNAME},free].last(0)}<1073741824

But as soon as i enable the triggers (there are ~470) the load goes up to ~5-6 and the whole system become unusuable.

The total nr of triggers is ~1100

Regards,

welkin

[Pada]

Did you perhaps enable the "Multiple PROBLEM events generation" option for that trigger?

If you didn't then I'm really out of ideas, except perhaps for splitting that trigger into 2 separate ones to see which is causing the high load.