[rrd-users] Pulling data out of rrds

[Steve Shipway]

Simon said
> I think that returns the last actual value supplied - which will be the
counter value from the last update. You need to use "fetch" to get the last
processed values.

... what he said.

rrdtool last
   This gives the timestamp of the latest PDP (after rate calculation and
normalisation)
rrdtool lastupdate
  This gives the timestamp and values of the RAW last update, BEFORE rate
calculation and normalisation.
rrdtool fetch
  This pulls out the timestamps and CDP values from the specified RRA, so
AFTER rate calculation, normalisation and Consolidation.
rrdtool updatev
  This updates the RRD with the supplied samples, and returns any CDP being
written to RRA; so AFTER rate calculation, normalisation and consolidation.
It may return zero or more CDP depending on how long it has been since your
last update.

Steve

Steve Shipway
s.shipway at auckland.ac.nz

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