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RRD Graph Description

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+The graphs in Torrus are drawn by +RRDtool, +a powerful instrument for data aggregation and graphing. +

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+The horizontal axis displays the time at which the data has been collected. +The rightmost point corresponds to the most recent moment. +

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+The date and time of the graph can be easily changed by using the +Set date checkbox at the bottom of the page. When the checkbox is +checked, the date/time string in the text field is interpreted after clicking +the submit button. It is then reflected in the Report date +informational line at the page displaying the graphs. The date format is +quite flexible. It understands such input as "July 13 5:00", +or "01/13/2003 5:00", etc. +

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+The vertical axis scales automatically to fit the data values. The meaning of +the values depends on the nature of the datasource, and is usually described +in the graph legend, comments, and the help text. +

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+Usually the legend of the vertical axis specifies the meaning of the values: +

Bps: bytes per second counter
bps: bits per second counter
pps: pakets per second counter

+Other legends correspond mostly to gauges, such as temperature, load +percentage, or disk space. +

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+The graphing engine automatically chooses the best units for scaling +the values. The scaling magnitude is displayed alongside the numerical value, +with the following meaning: +

a: 10e-18 Atto
f: 10e-15 Femto
p: 10e-12 Pico
n: 10e-9 Nano
u: 10e-6 Micro
m: 10e-3 Milli
k: 10e+3 Kilo
M: 10e+6 Mega
G: 10e+9 Giga
T: 10e+12 Tera
P: 10e+15 Peta
E: 10e+18 Exa

+Memory usage is scaled with the base of 1024. +

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