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Platform Team/Server Kit/Guide/Usage Statistics (view source)

Revision as of 12:51, 16 February 2012

662 bytes added , 12:51, 16 February 2012

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==Factors affecting network bandwidth==

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The ~~two primary factors affecting~~ the network bandwidth ~~are:~~

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The only factor that really affects the network bandwidth usage is the resolution at which the data is being stored. Currently, the default step-size is 60 seconds.

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* the ~~size of~~ the ~~RRDs~~ being ~~synced~~

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* and the ~~sync frequency~~.

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==~~=RRD~~ size===

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==Factors affecting database size on the client side==

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* This is primarily controlled through RRA (parameters). I will upload more notes on this as I get to know RRD's better. (Anish)

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~~===Sync frequency===~~

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The factor that affects the database size on the client is the RRAs (Round Robin Archives) being cached on the Client XO.

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* This is ~~controlled by~~ the ~~<tt>update-timeout</tt> parameter in~~ the ~~sugar-client configuration~~.

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~~<span style="color: red;">'''Caution:'''~~ The default ~~RRD parameters and~~ the ~~sync frequency don't quite match up~~. ~~The RRDs track usage statistics for around 8-10 days and~~ the ~~sync frequency is~~ one ~~hour!~~ This ~~needs~~ to be ~~tweaked appropriately while deploying in~~ a ~~production environment to save~~ on ~~bandwidth~~.</~~span>~~

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The default RRA configuration on the client side reads something like

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RRA:AVERAGE:0.5:1:4320

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RRA:AVERAGE:0.5:5:2016

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This means that there is one RRA (Round robin archive) within the DB that stores one value every minute for 4320 samples. This makes the total length of this 1 minute resolution RRA to be 4320 minutes = 3 days

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The other RRA stores an average of 5 samples, for a total of 2016 samples. Thus its total duration is 5x2016 min= 10080 min= 7 days.

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Thus the default duration of high resolution samples is 3 days and lower resolution samples is 7 days. Tweaking these values will affect both the database size on the client size and the network usage.

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For locations with very intermittent connectivity, having bigger-duration databases might be advisable. sample RRA's could be

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RRA:AVERAGE:0.5:1:43200 (30 days)

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RRA:AVERAGE:0.5:5:20160 (70 days)

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The above sample values will not be having any impact on network usage, since we're not increasing their resolution, frequency or adding/removing more RRA's

M anish

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