Older pSeries systems (Power4) are equipped with environmental sensors. You can read the sensor values using:
# /usr/lpp/diagnostics/bin/uesensor -l You can use these sensors to monitor your systems and your computer rooms. It isn't very difficult to create a script to monitor these environmental sensors regularly and to display it on a webpage, updating it automatically. Newer systems (LPAR based) are not equipped with these environmental sensors. For PC systems several products exist, which attach to either a RJ45 or a parallel port and which can be used to monitor temperatures.