Fetcher Problem

[Tobias13 (Grossmann)]

CMK version:CEE
OS version:buster

Error message:

Hi together, I already adjusted our fetchers to 25, but I still get Errors and warnings, any ideas to that?

KR,
Tobias

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)

[gstolz (Gerd Stolz)]

Hi Tobias,

the number of required fetchers depends on the number of hosts (with agent or SNMP) you need to check, the interval in which you check and how long each check will block a fetcher.

let’s assume you have an interval of 60 seconds, that means the fetchers need to fetch data from 412 hosts per minute.

Now if each of them takes 10 seconds, that means every minute, you need 412 * 10 seconds = 4120 seconds that need to be covered, and every fetcher has 60 seconds, so 25 * 60 = 1500.

This is just an example, most installations will not need an average of 10 seconds per check, but if you have a lot of slow snmp devices, it could happen.

You can either look through the execution times of the “Check_MK” Service and do a thorough calculation, or if you have CPU + Memory resources left, keep increasing the fetcher helpers. (Or raise the check interval if you are resource bound.)

Gerd