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From jagernico...@legtux.org
Subject Sizing a cluster
Date Tue, 01 Oct 2019 11:40:38 GMT
Hi,
We want to use Cassandra to store camera detection. The size of a picture + data is about
0.5MB. We starting with 5 devices, but we targeting 50 device for the next year, and could
go up to 1000. I summary everything ,
	*  Number of sources: 5 - 50 - 1000 (src)  
	*  Frequency of data: 1Hz (f)  
	*  Estimate size of data: 0.5MB (s)  
	*  Replication factor: 3 (RF)  
I calculated the size per year,
	* src * f *60 * 60 * 24 * 365 * s
gives me,
	* 5 sources = 0.24 PB per year 
	* 50 sources = 2.4 PB per year 
	* 1000 sources = 47.3 per year 
so if respect the 2TB rule, I got, 120 nodes in the simplest case (5 sources). Am I right
?

regards,
Nicolas Jäger

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