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rras.append(RRA(cf='AVERAGE', xff=0.5, steps=1, rows=rows))
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rras.append(RRA(cf='AVERAGE', xff=0.5, steps=12, rows=rows))
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my_rrd = RRD(filename, ds=dss, rra=rras, start=start, step=step)
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for i, t in enumerate(range(start+step, start+step+(rows*step), step)):
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# Add further data 1 second later to demonstrate that the rrd