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Problem

You may be affected by that:

To visualize a graph, Checkmk is using RRD. The RRD needs by nature two files:

rw-rw---- 1 master master      93 Jun  2 07:21 CPU_Utilization_Packet_CPU_2.info
-rw-r--r-- 1 master master  384952 Jun  2 11:22 CPU_Utilization_Packet_CPU_2.rrd

The .rrd file stores all the data and the .info file defines the service metrics. If one of the file is missing, you will face the message above. This message will also be displayed in the cmc.log:

OMD[mysite]:~$ tail -f var/log/cmc.log
2022-06-02 12:09:41 [4] [main] [rrd] [rrdcached at /omd/sites/master/tmp/run/rrdcached.sock] >> -1 No such file: /opt/omd/sites/master/var/check_mk/rrd/<HOSTNAME>/CPU_Utilization_Packet_CPU_1.rrd
2022-06-02 12:10:41 [4] [main] [rrd] [rrdcached at /omd/sites/master/tmp/run/rrdcached.sock] >> -1 No such file: /opt/omd/sites/master/var/check_mk/rrd/<HOSTNAME>/CPU_Utilization_Mgmt_CPU.rrd
2022-06-02 12:10:41 [4] [main] [rrd] [rrdcached at /omd/sites/master/tmp/run/rrdcached.sock] >> -1 No such file: /opt/omd/sites/master/var/check_mk/rrd/<HOSTNAME>/CPU_Utilization_Packet_CPU_0.rrd

Solution

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Unfortunately, for some reasons one of the file is missing. In that case it is the .rrd file. So to make the graphs working again, you need to find all the .info files with a missing .rrd file and to delete them manually: 

Code Block
language bash theme RDark
OMD[mysite]:~$ for i in $(find ~/var/check_mk/rrd -name *.info); do test -e ${i%info}rrd || echo $i;done /omd/sites/mysite/var/check_mk/rrd/<HOSTNAME>/PING.info /omd/sites/mysite/var/check_mk/rrd/<HOSTNAME>/CPU_Utilization_Mgmt_CPU.info /omd/sites/mysite/var/check_mk/rrd/<HOSTNAME>/CPU_Utilization_Packet_CPU_1.info /omd/sites/mysite/var/check_mk/rrd/<HOSTNAME>/CPU_Utilization_Packet_CPU_0.info

Now you have a least with files to delete. Please replace echo $i with rm $i in order to delete those files.

Note
Checkmk does not delete any .rrd file. So it could be deleted by a custom cleaning job!

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