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Info


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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


Warning

In order to automate those steps, you can get a script from Checkmk Support


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  1. Change to the rrd directory

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    OMD[mysite]:~$ cd var/check_mk/rrd/<HOSTNAME>


  2. How many metrics are stored in the .info file?

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    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;outdisc

    15 Metrics are stored here

  3. How many datasources do we have in the .rrd file?

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    OMD[test]:~/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"

    -->  11 Datasources are stored. As described in the cmc.log, the DS 5,6,11 and 12 are missing

  4. So here we have a mismatch of the amount of metrics in the .info (15 Metrics ) file and the amount of Datasources (11 DS) in the .rrd file

  5. We need to create the missing DS into the rrd file. 

    Note

    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 files beforehand. 


    1. Stop the site

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      OMD[mysite]:~$ omd stop


    2. Create the 4 missing datasources

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      rrdtool tune Interface_2.rrd DS:5:GAUGE:8460:0:U
rrdtool tune Interface_2.rrd DS:6:GAUGE:8460:0:U
rrdtool tune Interface_2.rrd DS:11:GAUGE:8460:0:U
rrdtool tune Interface_2.rrd DS:12:GAUGE:8460:0:U

      More information about the command could be found here: https://oss.oetiker.ch/rrdtool/doc/rrdtune.en.html

    3. Start the site

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      OMD[mysite]:~$ omd start


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