In <759D40D52DC37D4E980D9DC9CEC59880114CDB at IRONV.imc2k3.local> "Gregory Wege" <gwege at infomanage.net> writes:
I'm completing a performance analysis of several servers. In doing this I'm seeing inconsistency in the scales in the various charts displayed in Hobbit when viewed for different time periods. For example one of my web servers had a performance spike, this spiked was picked up in the 24 hour graph, but not the 12 hour. Is there anything that can be done to remedy these scales?
This is a feature of the way RRD works - data is always averaged over a period of time. Each of the four datasets contain 576 datapoints, so the 48-hour graph averages data over (48 hours / 576) = 5 minutes - this happens to be the same as the polling interval, so the 48-hour graph will show individual measurements.
However, the 12-day graph (I assume that's the one you're referring to) still has only 576 datapoints, so each of these is an average over a 30-minute period. This will obviously flatten out brief spikes in your observations.
Regards, Henrik