[rrd-users] Re: Step vs. Heartbeat

[Thomas Erskine]

At 07:16 2003-05-08, Jeff Rodriguez wrote:
 >So would it be correct to say that Step is only used as a multiplier for
 >RRAs?

No.  Step tells the spacing of the original data points.  This is critical 
and not related to RRAs.  Combined with the start, it specifies the 
timestamps for all future updates.  If you don't update at exactly those 
timestamps (start+step, start+2*step, ...) rrdtool will interpolate to 
figure out what the value would have been at the correct time-stamp.  For 
many things this doesn't matter greatly.  If you want precise data, this is 
important.

 >Jeff
 >----- Original Message -----
 >From: "Thomas Erskine" <thomas.erskine at sympatico.ca>
 >To: <jeff at unixisgod.com>; <rrd-users at list.ee.ethz.ch>
 >Sent: Thursday, May 08, 2003 04:01
 >Subject: [rrd-users] Re: Step vs. Heartbeat
 >
 >
 >> At 04:34 2003-05-08, jeff at unixisgod.com wrote:
 >>  >Can someone explain to me what the difference between step and heartbeat
 >is?
 >>
 >> Step specifies the resolution of the data (e.g. one point every 5
 >> minutes).  Heartbeat specifies how often the rrd must be updated to avoid
 >> rrdtool deciding to insert unknown values.  (And for completeness,) xff
 >> specifies what proportion of primary data points must be present in a
 >> consolidation interval for the resulting consolidated data point to be
 >> considered valid (i.e. not unknown).
 >>
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 >> Thomas Erskine <thomas.erskine at sympatico.ca> +1.613.591.8490
 >>
 >>
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Thomas Erskine <thomas.erskine at sympatico.ca> +1.613.591.8490 


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