Hi Michael,
yes, your reply is very helpful as it corrects my understanding of how the
RRD database is defined. Makes all a lot of sense now.
So I am basically defining my RRAs as follows, with a 4 sec polling intervall:
RRAs "RRA:AVERAGE:0.5:1:315" \
"RRA:AVERAGE:0.5:3:315" \
"RRA:AVERAGE:0.5:24:315" \
"RRA:AVERAGE:0.5:72:315" \
"RRA:AVERAGE:0.5:504:315" \
"RRA:AVERAGE:0.5:1008:315" \
"RRA:AVERAGE:0.5:2016:315" \
"RRA:AVERAGE:0.5:6048:315" \
"RRA:AVERAGE:0.5:12096:315" \
"RRA:AVERAGE:0.5:21600:370"
With 5% margin from 20-minutes to 6-month and 370 days for the year.
Cheers
Martin
----- Original Message ----
> From: Michael Perzl <mich...@perzl.org>
> To: ganglia-developers@lists.sourceforge.net
> Sent: Wed, November 25, 2009 4:55:19 PM
> Subject: Re: [Ganglia-developers] Question on the Ganglia RRD Database
>
> Hi Martin,
>
> I think this is how the default monitoring intervals have to be interpreted:
>
> RRAs \
> "RRA:AVERAGE:0.5:1:240" \
> "RRA:AVERAGE:0.5:24:240" \
> "RRA:AVERAGE:0.5:168:240" \
> "RRA:AVERAGE:0.5:672:240" \
> "RRA:AVERAGE:0.5:5760:370"
>
> used for
> display of
> Take 240 samples at 15 seconds intervals hour
> Take 240 samples at 24 × 15 seconds (= 6 minutes) intervals day
> Take 240 samples at 168 × 15 seconds (= 42 minutes) intervals week
> Take 240 samples at 672 × 15 seconds (= 168 minutes) intervals month
> Take 370 samples at 5760 × 15 seconds (= 24 hours) intervals year
>
> So I think for your case you have to decide "how many" samples of the
> chosen sampling rate (20 minutes, 8 hours etc.) you want to collect
> which then determines the overall time interval covered by this specific
> sampling rate.
>
> The main question is: How granular do you want the sampling rate to be
> for a given time interval?
>
> This then determines:
> a) the number of multiples of 15 seconds (to get the sampling rate)
> b) the total number of samples required ("number of samples" x "sampling
> rate" = "time interval")
>
> Hope that helps.....
>
> Regards,
> Michael
>
> On 11/25/2009 02:24 PM, Martin Knoblauch wrote:
> > Hi folks,
> >
> > currently I am setting up monitoring for a cluster, where the demand is
> > to
> have additional monitoring intervalls. We want to see stuff like
> "20-minutes",
> "8-hours", "2-weeks", "3-month" and "6-month". Doing so seems easy, but I
> have a
> question on the RRA definitions.
> >
> > The default setup seems to be (assuming a 15 second polling intervall):
> >
> > hour -> "RRA:AVERAGE:0.5:1:244"
> > day -> "RRA:AVERAGE:0.5:24:244"
> > week -> "RRA:AVERAGE:0.5:168:244"
> > month -> "RRA:AVERAGE:0.5:672:244" (more like 4-weeks :-)
> > year -> "RRA:AVERAGE:0.5:5760:374" (367.86 days)
> >
> >
> > So from hour to month we have 244 datapoints with nicely increasing
> > steps
> (1,24*1,7*24*1,4*7*24*1). So why are we doing it differently for the year? I
> would have expected the "year" RRA to be "RRA:AVERAGE:0.5:8784:244" (366
> days).
> Any particular reasons for this?
> >
> > Cheers
> > Martin
> > ------------------------------------------------------
> > Martin Knoblauch
> > email: k n o b i AT knobisoft DOT de
> > www: http://www.knobisoft.de
> >
> >
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