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How to use rrdtool to inspect and insert data into RRD files
When troubleshooting issues related to graphing and rrd files the rrdtool can provide some insight.
Some examples of what you could do with rrdtool:
Verify that the rrd file have any data stored Copied
## rrdtool fetch --daemon unix:/opt/monitor/var/rrdtool/rrdcached/rrdcached.sock /opt/monitor/op5/pnp/perfdata/sw01.safdal.se/Errors_port_1_error_in.rrd AVERAGE
Manually update rrd file with data Copied
## rrdtool update /opt/monitor/op5/pnp/perfdata/sw01.safdal.se/Errors_port_1_error_in.rrd N:8.0883333333e+01
Show information about the rrd file Copied
## rrdtool info --daemon unix:/opt/monitor/var/rrdtool/rrdcached/rrdcached.sock /opt/monitor/op5/pnp/perfdata/sw01.safdal.se/Errors_port_1_error_in.rrd
Further reading: https://oss.oetiker.ch/rrdtool/doc/index.en.html
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