CPU Utilisation % Calculation Help Needed

[dbuchner]

Hi,

I am trying to calculate CPU % based on ucd_ssCpuRawIdle on several Solaris 10 hosts. Rather than grabbing kernel + user + wait to come to a total I figured it would be easier to simply grab RawIdle subtract this from 100 to get the total cpu usage.

On individual hosts this works fine but when trying to aggregate several hosts onto one graph I am really not getting anywhere with the calculation to obtain the correct figures for the %'s.

E.g. In the below screenshot I am trying to trend 11 hosts (one host per line, nevermind the colors atm) on the one graph.

The first issue is that the calculation applied to the RAWIdle won't work with multiple hosts since its a relative percentage:

CURRENT_DATA_SOURCE,100,*,ALL_DATA_SOURCES_NODUPS,/

I guess at the end of the day, I don't care how its done, I just don't seem to be able to figure out how to do this the most effective way. Has anyone else had any experiences with trying to display multiple DEFs on the one graph where each DEF is reflected as a relative % of 100?

[gandalf]

I suppose this may be solved using the COMPUTE data source featured by rrdtool. Then you may perform any CDEF on rrd file level and simply graph the resulting COMPUTE. This feature will be supported with cacti 0.8.8. Expect a beta in Nov/Dec or try current main trunk
Reinhard