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Some customers may run into an issue after rrd RRD migration where graphs are not working correctly. |
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Problem
After the rrd RRD migration, for some reason, some graphs are not recording values:
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2022-04-06 13:24:41 [4] [client 1] Error accessing RRD: No DS called '12' in '/opt/omd/sites/mysite/var/check_mk/rrd/schiller/Interface_eth1-02.45.rrd' 2022-04-06 13:24:41 [4] [client 1] Error accessing RRD: No DS called '6' in '/opt/omd/sites/mysite/var/check_mk/rrd/schiller/Interface_eth1-02.45.rrd' 2022-04-06 13:24:41 [4] [client 1] Error accessing RRD: No DS called '5' in '/opt/omd/sites/mysite/var/check_mk/rrd/schiller/Interface_eth1-02.45.rrd' 2022-04-06 13:24:41 [4] [client 1] Error accessing RRD: No DS called '11' in '/opt/omd/sites/mysite/var/check_mk/rrd/schiller/Interface_eth1-02.45.rrd' |
Solution
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To automate those steps, you can get a script from Checkmk Support. |
Change to the rrd RRD directory.
Code Block language bash theme RDark OMD[mysite]:~$ cd var/check_mk/rrd/<HOSTNAME>
How many metrics are stored in the .info file?
Code Block language bash theme RDark OMD[mysite]:~/var/check_mk/rrd/myhost.txt$ cat Interface_2.info HOST myhost SERVICE Interface eth0 METRICS outqlen;in;out;inerr;inmcast;inbcast;inucast;innucast;indisc;outerr;outmcast;outbcast;outucast;outnucast;outdis
15 Metrics are stored here
How many datasources do we have in the .rrd RRD file?
Code Block language bash theme RDark OMD[mysite]:~/var/check_mk/rrd/kirchner_check_mk_agent_output.txt$ rrdtool info Interface_2.rrd |grep "last_ds" ds[1].last_ds = "U" ds[2].last_ds = "U" ds[3].last_ds = "U" ds[4].last_ds = "0" ds[7].last_ds = "U" ds[8].last_ds = "U" ds[9].last_ds = "U" ds[10].last_ds = "U" ds[13].last_ds = "U" ds[14].last_ds = "U" ds[15].last_ds = "U"
Note 11 Datasources are stored. As described in the cmc.log, DS 5,6,11, and 12 are missing. - So here we have a mismatch of the number of metrics in the .info (15 Metrics ) file and the amount of Datasources (11 DS) in the .rrd file.
- We need to create the missing DS into the rrd RRD file.
Warning Before continuing here, please note that we do not provide support for any broken .rrd file. Please be careful and do a backup of that those files beforehand.
Stop the site
Code Block language bash theme RDark OMD[mysite]:~$ omd stop
Create the four missing datasources
Code Block language bash theme RDark OMD[mysite]:~$ rrdtool tune Interface_2.rrd DS:5:GAUGE:8460:0:U OMD[mysite]:~$ rrdtool tune Interface_2.rrd DS:6:GAUGE:8460:0:U OMD[mysite]:~$ rrdtool tune Interface_2.rrd DS:11:GAUGE:8460:0:U OMD[mysite]:~$ rrdtool tune Interface_2.rrd DS:12:GAUGE:8460:0:U
More information about the command can be found here: https://oss.oetiker.ch/rrdtool/doc/rrdtune.en.html.
Start the site
Code Block language bash theme RDark OMD[mysite]:~$ omd start
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