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  • 1.  Windows Resource Monitor vs. vCetner Performance tab

    Posted Oct 10, 2012 05:36 PM

    We have been watching CPU and memory resources on a VM by using the built in Windows Resource Monitor as well as the vCetner Performance tab and the data doesn't seem to be consistent. For example this morning Resource Monitor showed a 30 second spike in CPU to 100% but if I do a CPU view of that time period in the vCenter Performance area for CPU it doesn't show up there. Is one more accuarate than the other?



  • 2.  RE: Windows Resource Monitor vs. vCetner Performance tab

    Posted Oct 10, 2012 05:47 PM

    I ran a utility on a VM that maxes out the processor. Windows Performance Monitor and Resource Monitor showed the processor at 100%. The real time view in vCenter showed it at 100% as well but when I do a custom time frame view then it doesn’t show the spike on the chart for some reason.



  • 3.  RE: Windows Resource Monitor vs. vCetner Performance tab

    Posted Oct 10, 2012 07:16 PM

    Which Perfmon counters are you using and is VMware tools installed and up to date.



  • 4.  RE: Windows Resource Monitor vs. vCetner Performance tab

    Posted Oct 10, 2012 08:09 PM

    I was using the VM memory and VM processor counters but noticed something while playing around.

    Its seems as though when you do a set time period for a chart in vCenter that it may take an average because I ran a tool that maxes out the CPU and it showed up in real time mode but not in a custom time period mode when I ran it for a minute. But when I ran it for 5 minutes or so it would then show up in the custom time frame chart as if it had 100% CPU usage long enough to show up on the chart.



  • 5.  RE: Windows Resource Monitor vs. vCetner Performance tab
    Best Answer

    Posted Oct 10, 2012 08:52 PM

    The performance charts in vCenter vary in the collection periods and rollups. I think they breakdown as follows:

    Real time = every 20 seconds

    Daily =  every 5 minutes

    Weekly = every 30 minutes

    Monthly = every 120 minutes

    Yearly = every 24 hours

    It sounds like you might be getting caught up in between rollups. It's best if you take look at the performance troubleshooting guide and see if that helps you out. It's a great doc and covers esxtop as well.



  • 6.  RE: Windows Resource Monitor vs. vCetner Performance tab

    Posted Oct 10, 2012 10:27 PM

    If thats the case for the collection intervals that that would totally explain it. Thanks for the info!