Why historicalInterval is NULL for ESXi 5.0.0 build-504890 (no stats PastDay)?
Hello
I noticed that for our guests (ESXi 5.0.0 build-504890) of ESXi historicalInterval PerformanceManager property is not set (e.g. NULL). that is, there is no statistics 'Last day' in terms of vSphere client.
But according to the vSphere Web Services SDK Programming Guide :
ESXi servers also set a unique historical range (PerformanceManager.historicalInterval) that defines the overall performance data. This system-defined performance range specifies aggregated data collection every 300 seconds for each counter. You cannot change the intervals of performance on an ESXi server.
What is the problem with our guests?
P.S. these hosts are managed by vCenter
My guess - the parameter is basically ignored with a default installation. ESXi don't include all the data, but only to pass his stats in real-time to vCenter.
One time, I wrote on the extension of local performance on ESXi hosts data - http://www.vm-help.com/esx/esx3i/extending_performance_data.php. With this method, you could get up to 36 hours of a locally stored data value. I guess you could do it again with ESXi, in which case the setting would then get used. Why it is there in the first place, I'm not sure. I don't remember if early ESX version were able to store more data in real time on the spot.
Tags: VMware
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