[rrd-users] Re: Help needed on rrdtool create and rrdtool update
Chang-PingH at corp.netzero.net
Fri Jul 6 18:48:05 MEST 2001
The data come in at an unknown timing. That is why I had them updated at
"random" time and different interval. I read about the comparison between
heartbeat and step, and didn't seem to find a way around it. In the
document written by Don Baarda, it says,
".....If the interval between samples is longer than "heartbeat", the entire
interval is considered "unknown"......."
Meanwhile, I am not clear about whether this includes the end points of the
interval if they are primary data points in an RRD.
Serge was right on the data I tried to updated, 7200 is greater than 3600,
but I would think RRDTool can be smart enough to determine 99417900 is
unknown while 994176000 is 3 and 994183200 is 1, instead of thinking
everything in the interval including the end points are unknown.
Due to the nature of the data, if RRDTool cannot help, maybe I will need to
artificially put a "0" for every missing heartbeat. This isn't hard but is
definitely making my job more trivial.
> 994176000:3 994183200:1 994190400:1 994194000:4 994197600:4 994201200:5 \
> 994204800:4 994212000:8 994215600:1 994219200:1 994255200:1 994258800:2 \
> 994262400:4 994266000:2 994269600:3 994273200:2 \
> missing-> 994176000: NaN
> 994179600: NaN
> missing-> 994183200: NaN
> 994186800: NaN
> missing-> 994190400: NaN
> 994194000: 4.0000000000e+00
> 994197600: 4.0000000000e+00
> 994201200: 5.0000000000e+00
> 994204800: 4.0000000000e+00
> 994208400: NaN
> missing-> 994212000: NaN
> 994215600: 1.0000000000e+00
> 994219200: 1.0000000000e+00
> 994222800: NaN
> 994226400: NaN
> 994230000: NaN
> 994233600: NaN
> 994237200: NaN
> 994240800: NaN
> 994244400: NaN
> 994248000: NaN
> 994251600: NaN
> missing-> 994255200: NaN
> 994258800: 2.0000000000e+00
> Hmm, what I do see is that you have a heartbeat of 3600 secs. Your
> updates (at least the first two ones, didn't check the other ones) on
> the other hand are made with a 7200 sec interval. This is
> well over the
> heartbeat threshold, so rrdtool will take the value for a NaN.
> -----Original Message-----
> From: Chris Snell [mailto:cjs+lists at aol.net]
> Sent: Thursday, July 05, 2001 6:48 PM
> To: Chang-Ping Hsiao; Rrd-User (E-mail)
> Subject: Re: [rrd-users] Help needed on rrdtool create and rrdtool
> I took a quick glance at your rrdupdate and it looks like you are
> occasionally updating at an interval different from your --step.
> >the RRDs after update. Could anyone help? I can't seem to
> find where the
> >problem is. Did I make some mistakes in "rrdtool create", "rrdtool
> >update", or "rrdtool fetch"?
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