RRD .info file missing

Troubleshooting
1

Hi folks,

I have some problems regarding RRD files.
Some interfaces on some of the monitored switches do not show performance data.
I was able to identify (maybe) the root cause of this.

In cmc.log I found the below error message.
So it looks like the RRD .info file is missing for the interfaces.

I found information to identify missing RRD files in the following document:
How-to debug graphs not being created - Checkmk Knowledge Base - Checkmk Knowledge Base

But my problem is a missing .info file!
So I have modified the script line to identify the RRD files without .info file but now I don’t know how to create it?!

So here my question:
How do the system create the .info file in folder /opt/omd/sites//var/check_mk/rrd/ regularly and how can I create the missing ones now?

Restarting the site was not helping.
Rules for “Configuration of RRD databases of hosts/services” exists.

Thanks and Regards
Eike

CMK version:
1.6.0p30

OS version:
RHEL 7.9

Error message:
2024-04-29 11:50:24 [4] [main] [rrd] [RRD helper 2073] >> Error creating RRD for cmc_single;;;dot11g;0;dot11a;0: Invalid RRD info file /opt/omd/sites//var/check_mk/rrd//.info: [Errno 2] No such file or directory: ‘/opt/omd/sites//var/check_mk/rrd//.info’

2

These files are tightly coupled with the .rrd for the service metrics.
They are created when the first metric data is stored for the service.

You cannot recreate them because the order of the different metrics for a service is important.

Never delete .info files.

3

Hi Robert,

thanks for your comment.
I don’t know why or who has deleted the .info files.

To restore the functionality, will it help if I delete the RRD files without a corresponding info file?
If yes, as I understand, the performance data stored in the RRD file is gone, am I right?

Thanks & Regards
Eike

4

Yes. Or you have a backup from which you can restore the .info file.