Cheshire Cat Computing

I am trying to graph the current load on an APC AP7941 Switched PDU, and getting the SNMP readings from the PDU is no problem, but when I try and have routers2.cgi graph it, I can't get the reading to scale correctly.

For example, say I have an 11.5 amp draw on the strip, when I graph it, instead of getting it to show 11.5 amps, it shows as 115 amps, which of course would be some crazy current.

I saw where in MRTG I could use YTicsFactor to change readings, but I am guessing when coupled with RRD and Routers2, that this doesn't function, as I have tried setting this, but still my routers2 graphs show the same.

Here is a sample of what I am doing in my MRTG config:




I also have BayTech strip that is also SNMP monitorable, but again the same issue. Does anyone have a working config for APC or BayTech PDU's??

Most likely, the SNMP is returning the value in tenths of a volt (as the value must be an integer).

To fix this, add ' / 10' to the end of the Target definition (space stroke space ten) which converts the value into the SI unit, volts.



Note that you could also use 'Factor[]: 0.1' but this will perform the calcuation between the store and display stages (IE, Routers2 does it), whereas the first method does it between the retrieve and store phases (IE, MRTG does it). It is Best Practice to store the data in SI units, so the first method is preferable to the second.

_________________
Steve Shipway
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11

Thanks Steve, worked like a charm.. As many years as I have used mrtg/rrdtool, and I never knew you could divide the result of the query..