[rrd-users] Max and Min logging.
linux at thehobsons.co.uk
Wed Dec 31 09:25:33 CET 2008
At 13:45 +0000 24/12/08, I wrote:
>I'm just setting up logging for the new UPS at work, and looking at
>teh SNMP MIB I see that it has entries for "The maximum utility line
>voltage in 0.1 VAC for last 1 minute." and "The minimum utility line
>voltage in 0.1 VAC for last 1 minute." as well as plain input
>voltage. I'm not really interested in logging voltage in small
>detail, but I would be interested in having max and min.
>So if I were collecting data once a minute, and only graphing at 5
>minute resolution, is there an easy way to get the min and max values
>into the RRD ?
>The only way I can think of is to set step to 1 (with suitably long
>heartbeat), and do 3 (or 4 ?) updates in close succession. Ie, do
>updates for t:act, t+1:min, and t+2:max (where act is current voltage
>reported, and min/max are the "min/max over last minute" reported by
>the UPS) to set the actual value for the last 58s, then the min and
>max for 1s each.
No ideas ?
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