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Change to the rrd directory

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

How many metrics are stored in the .info file?

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

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

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

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

1. Stop the site
   

   Code Block
   language bash theme RDark title Click to expand collapse true
   OMD[mysite]:~$ omd stop

   
   

2. Create the 4 missing datasources

   Code Block
   language bash theme RDark collapse true
   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

   Code Block
   language bash theme RDark title Click to expand collapse true
   OMD[mysite]:~$ omd start