[rrd-users] Questions

Jonathan Daugherty cygnus at janrain.com
Tue Nov 21 00:07:33 MET 2006


I use RRD to graph application usage statistics at my company.  I have
some questions:

 - What is the difference between GAUGE and ABSOLUTE data sources?
   Considering my use case, I can't tell from the man page, based on
   my use case:

   GAUGE is "for things like temperatures or number of people in a
   room or the value of a Redhat share."

   ABSOLUTE is "is for counters which get reset upon reading."

   I'd like to count, say, the number of new IP addresses in my apache
   log each hour, or the number of new accounts on a web site.  Which
   one is best?  And is the choice of GAUGE or ABSOLUTE important when
   you want to use AVERAGE RRAs?

 - If I have an RRD with a Gauge DS of 5-minute resolution, is there a
   way to compute (and store in an archive) the sum of all values from
   the DS over, say, a one-hour or one-month period?

   I guess I could have archives of one-hour and one-month resolution
   and compute the totals externally.  The TOTAL RPN function seems to
   do what I want, but only at graph-rendering time, and its domain is
   the entire graphed data set.  I just want to feed small samples
   into RRD and find out later what happened over the course of a
   particular week, month, or year.

Any and all help will be greatly appreciated!


  Jonathan Daugherty
  JanRain, Inc.

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