[smokeping-users] Re: RRD data and 'step' config parameter

[Keith Redfield]

Further to this: created a new host entry in the same config file, ran it for a bit and the dump on that file shows 90-sec intervals. So I think indeed this represents an undocumented feature ;)
-Keith

-----Original Message-----
From: smokeping-users-bounce at list.ee.ethz.ch on behalf of Keith Redfield
Sent: Wed 12/1/2004 4:07 PM
To: smokeping-users at list.ee.ethz.ch
Subject: [smokeping-users] RRD data and 'step' config parameter
 
I am trying to understand how the RRD files generated by smokeping correspond to the polling interval. I simulated an outage by re-booting a monitored box and wanted to look at the raw data to see how it appeared there (smokeping.cgi shows a few ping losses, but I wanted to see timestamps). Step and pings are set to 90 and 20 in smokeping.conf.
 
I dumped the data using 'rrdtool dump' and it appears to only be stored as 5-min intervals [corresponding to the graph]. There are 20 data elements which appear to be latency readings for the 20 pings. However, I have 'step' configured for 90 seconds, not 300, so I would have expected to see 90-sec intervals (20 pings/interval) in the datafile. 
 
Is rrdtool/smokeping only storing selected readings regardless of the step interval? Or is the problem because I started this RRD file on 300sec orginally and did a 'smokeping --restart' when I later changed step to 90? (I would consider that a bug). Or am I just completely clueless as to what the raw data is actually showing?
 
I am using the CiscoRTTMonEchoICMP probe for this.
 
TIA
 
-Keith
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