RZ2 temperature monitoring

This page shows the measurements from a number of Dallas Semiconductors 1-wire DS18x20s temperature sensors in and around our datacentre (RZ2). They are connected to a PIC-controlled IO-board (IOM#142A by Peter H. Anderson (1946-2012), www.phanderson.com).

When I first put this page up, probably around 2006, it was never intended to be anything but a quick demo, and certainly not intended to last for so long. However, it quickly proved itself very useful for monitoring the cooling in the datacentre which has turned a little flaky over the years.

The sensors measure the outdoor temperature, the temperature in the datacentre, the aircon intake temperature, plus the temperature of the refrigerated air. We also monitor changes in trends, to try to spot failing components ahead of time.

The graph and the trends are of course generated by Tobias Oetikers excellent RRDTOOL. The temperatures are read about once a minute, and the results are stored in the RRD repository.

Since March 2013 we have also been archiving the daily charts.

temperature graph
Timespan: last 60 minutes | last 6 hours | last 24 hours | last 7 days | last 30 days

Last reading:17:20:31 CEST (1585754431)
LocationIDReadingWire#Device#Type4h trend24h trend7d trend30d trend
RZ2 cooling 35884.4 °C10 DS18S200.04-0.02-0.090.05
RZ2 room 3D7C25.1 °C11 DS18S200.050.01-0.030.00
Outside 274511.6 °C12 DS18S20
RZ2 intake 7F7522.8 °C13 DS18B200.060.00-0.030.01
Unknown A22B13.7 °C90 DS18B20
Unknown 630413.8 °C91 DS18B20
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