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manual:087:8_rrdtool [2009/09/01 15:19]
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manual:087:8_rrdtool [2009/09/01 15:25] (current)
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 This chapter shows some information about specific rrdtool features that are not covered in other chapters. Even when not using Cacti (yet), you may find it helpful for a better understanding. This chapter shows some information about specific rrdtool features that are not covered in other chapters. Even when not using Cacti (yet), you may find it helpful for a better understanding.
 +
 +===== RRD Files =====
 +
 +The rrd files are designed to never grow in space, even if you constantly feed data to them. How come? There's a buitin compression feature; rrdtool calls this //consolidation//. Read on to understand this better.
 +
 +By default, a rrd file holds more than one consolidation level. The initial layout, defined when creating the file using //rrdtool create//, is such (courtesy engeishi):
 +
 +{{:manual:087:rra_period.png|Default Consolidation Levels}}





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