How to do arithmetic in Zabbix ?

[marozsas]

Hi !

I am trying to setup a bandwidth monitor.

I successfuly setup a input data graph defined as net.if.in[eth0] and stored as Delta (speed per second) and a similar output data graph.
Theses 2 works fine.

Now I want to get the total bandwidth, sum of delta of in and out.

The question is how to define a total bandwidth.

I tried to define a item as net.if.in[eth0].change+net.if.out[eth0].change, no luck.

Looks like the operators change, now, prev does not work. they are ignored. I'm right ?

any hints ?

[mary nancy]

just try this

({{HOSTNAME}.net.if.in[eth0].change}+{{HOSTNAME}.net.if.out[eth0].change})

[marozsas]

just try this

({{HOSTNAME}.net.if.in[eth0].change}+{{HOSTNAME}.net.if.out[eth0].change})

Thanks.

Looks like the operator change does not work for net.if. I got the same results with and without .change. This hapens to you too ?

[root@lasthope ~]# zabbix_agentd -t net.if.in[eth0].change
net.if.in[eth0]                               [u|1193170127]
[root@lasthope ~]# zabbix_agentd -t net.if.in[eth0]
net.if.in[eth0]                               [u|1193172426]

Anyway, I submited a patch to zabbix_agentd creating a new type: net.if.total.
With this type it is easy to create a total bandwidth graph.
If anyone is interested, take a look at my post in Zabbix Patches.

thank you nancy !