[rrd-users] Help with RRD.... in over my head

[v g]

I hear what you are saying.  I was entering in about 4000 data points
spread out across 24 hrs  and getting these type of errors:
return_value = -1
' to float not complete: tail 'rsion of '0

I decreased the data count to 2 to see if I could isolate which value was
causing that tail rsion error.  I will play around further with what you
suggested but any ideas on the error noted above?

Thanks for all your time. I really appreciate it.






On Thu, Jan 19, 2012 at 1:55 PM, Steve Shipway <s.shipway at auckland.ac.nz>wrote:

> You are not entering enough values to get a complete cdp.****
>
> ** **
>
> This is important:****
>
> --start 1325232008 --step 180 \****
>
> …****
>
> RRA:AVERAGE:0.5:20:10000****
>
> ** **
>
> What this says is the STEP of the RRD is 180 seconds, or 3 minutes (often,
> people will use 1min or 5min).****
>
> ** **
>
> You are only STORING the data in a single RRA, which  has 10,000 cdp
> lines, where each cdp (consolidated data point) is the AVERAGE of 20 dps
> (data points).****
>
> ** **
>
> So, you need to write 20 data points, at 3min intervals, before you get
> ONE cdp stored.  Your xff is 0.5 which means that a cdp will remain unknown
> until at least 50% (IE, 10) points are written.****
>
> ** **
>
> This means you will get NaN output from your fetch until you have done at
> least 30 mins of data!****
>
> ** **
>
> Your test data had only 2 data points, and they are only 21 seconds apart,
> so the second would be ignored anyway.  Try entering in at least 10 dps,
> with time intervals of 180, and you should start seeing a single cdp on
> your fetch.****
>
> ** **
>
> I suspect you are not setting the step or RRA parameters appropriately.
> Maybe try an additional RRA with AVERAGE:0.5:1:10000 (so each data point is
> stored),  and/or decrease the step?****
>
> ** **
>
> Steve****
>
> ** **
> ------------------------------
>
> *Steve Shipway*
>
> ITS Unix Services Design Lead****
>
> University of Auckland, New Zealand****
>
> Floor 1, 58 Symonds Street, Auckland****
>
> *Phone: +64 (0)9 3737599 ext 86487*
>
> *DDI: +64 (0)9 924 6487*
>
> *Mobile: +64 (0)21 753 189*
>
> *Email: s.shipway at auckland.ac.nz*
>
> P Please consider the environment before printing this e-mail ****
>
> * *
>
> ** **
>
> *From:* v g [mailto:infiniteseeker at gmail.com]
> *Sent:* Friday, 20 January 2012 6:56 a.m.
> *To:* Steve Shipway
> *Cc:* rrd-users at lists.oetiker.ch
> *Subject:* Re: [rrd-users] Help with RRD.... in over my head****
>
> ** **
>
> Hi****
>
> ** **
>
> Thanks for your reply.  Still having an issue but managed to isolate it
> further.  It looks like it enters the first update correctly and then fails
> on the subsequent ones.  Obviously, I am not doing something correct but I
> cant figure out what.  ****
>
> ** **
>
> ** **
>
> ** **
>
> Here is what I did as per your suggestion:****
>
> ** **
>
> Creating RRD file:****
>
> ** **
>
> rdtool create birken-boiler.rrd \****
>
> --start 1325232008 --step 180 \****
>
> DS:boiler_out_flow:GAUGE:600:0:U \****
>
> DS:boiler_in_flow:GAUGE:600:0:U  \****
>
> DS:vihara_in_flow:GAUGE:600:0:U  \****
>
> DS:vihara_out_flow:GAUGE:600:0:U \****
>
> DS:outbldg_in_flow:GAUGE:600:0:U  \****
>
> DS:outbldg_out_flow:GAUGE:600:0:U  \****
>
> DS:cistern_top:GAUGE:600:0:U  \****
>
> DS:cistern_bottom:GAUGE:600:0:U  \****
>
> DS:boiler_flow_gpm:GAUGE:600:0:U  \****
>
> DS:vihara_flow_gpm:GAUGE:600:0:U \****
>
> DS:outbldg_flow:GAUGE:600:0:U  \****
>
> DS:boiler_btu_per_hr:GAUGE:600:0:U  \****
>
> DS:vihara_btu_per_hr:GAUGE:600:0:U  \****
>
> DS:outbldg_btu_per_hr:GAUGE:600:0:U \****
>
> RRA:AVERAGE:0.5:20:10000****
>
> ** **
>
> Entering in Values:****
>
> ** **
>
> rrdtool updatev birken-boiler.rrd
> 1325404770:102.7:137.1:140.0:122.6:126.8:122.2:258.7:138.4:0.0:5.0:0.0:0:43482:0
> ****
>
> rrdtool updatev birken-boiler.rrd
> 1325404791:102.6:137.2:140.2:121.9:126.7:122.1:260.2:145.2:0.0:5.0:0.0:0:45586:0
> ****
>
> ** **
>
> Output:****
>
> ** **
>
> return_value = 0****
>
> [1325235600]RRA[AVERAGE][20]DS[boiler_out_flow] = NaN****
>
> [1325235600]RRA[AVERAGE][20]DS[boiler_in_flow] = NaN****
>
> [1325235600]RRA[AVERAGE][20]DS[vihara_in_flow] = NaN****
>
> ** **
>
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