Creating an average over multiple data sources...

[chummers]

Hiya,

I am currently using cacti to monitor temperature/humity rise and decrease in our data centre.

I have been asked if i can take the values of all the temperatures and then create an average across the temperature sensors.

I am not entirely sure that cacti can do this, as i means creating a 'average' graph from all the other data sources...

At the time i was thinking it could be done, but now i am not so sure, the temperature values are being obtained from an OID, so there are no scripts running to manipulate..

I have also considered writing a script to get the last values out of each RRA file and get the script to do the calculation, and output the single value average..

Is this possible or am i barking up the wrong tree??

I would appreciate any perls of wisdom

Regards,

Chummers.

[gandalf]

Are all sensor data provided by the same target device?
R.

[chummers]

Hi Gandalf!

Sadly they are not they are spread of multiple SNMP devices.

I am currently looking at a script that will pull the last bit of data out of the RRA, and then work out the average.

I am not sure if this is the best way or not, or if there is a more elegent way (built in) to do this is cacti itself??

[gandalf]

This might be solved by AGGREGATE to get all graphs, summing all data sources. To get the average, you will have to change the CDEF and divide by the number of data sources (there's a new cacti pseudo variable for number of all data sources in a graph)
R.

[chummers]

Thanks Gandalf!

I will have a look in to this

I appreciate the pointer