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Cacti also tries to fill in internal data source path and name information to keep graphs from "breaking" when possible.
settings: You can now change the PHP Binary path from within cacti.
If you create a data source name that rrdtool will not like, cacti will automatically modify the name and save it internally for rrdtool-only use.
2013/03/12 [PERL WARNING] Use of uninitialized value in concatenation (.) or string at /opt/munin/www/cgi/munin-cgi-graph line 237.
2013/03/12 [FATAL] Could not open image file "/var/opt/munin/cgi-tmp/munin-cgi-graph/example.com/munin.example.com/meminfo_phisical/kernel-day.png" for reading: No such file or directory Yep, this was the issue.
2) You can dump the RRD to an XML file and edit the values before reading the XML into a new RRD file.
In theory it would be possible to directly edit the RRD file, but there are no tools for that.