[sdnog] cacti and old data values

[Samir S. Omer]

Hi all 

can someone explain to me how does cacti/rrds work exactly in term of storing values ? 
I noticed that the values get inaccurate when time is defined for old times 

for example when I show the graph for last two days it shows a spike in traffic. However, if I set the time for the last week I see the graph is gone and graph is normal. 


Samir 
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