[Ganglia-developers] Question on the Ganglia RRD Database

[Martin K. <kn...@kn...>]

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
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Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www:   http://www.knobisoft.de