Get some pics of use with get-stat

In vCOps, you have the concept of the 95th percentile, which allows you to get the 'average of the peaks '.  The idea is that you're taking a set of data points and get the 95th percentile of them for something like the CPU demand MHz for a set of virtual machines.

Transfer to PowerCLI - in powerCLI rely on database of vCenter data points that were on average through the stacks.

The problem is the following:

If I use that data points in the last hour of the statistics 'real-time', my 95th percentile is made with points of data representing the polling intervals of 20 seconds.

When I move the data points "Last day", then I use averages of these 20 seconds, question marks to get just the data points that represents the average of the 5 minute intervals.  In other words, I've already lost a part of my high and low data points in the update rollup and by 5 minute data are smoothed out now to be an average of the 20 seconds that I had.

Then spend a week and I have stacks of my data points "last day."  Now my data points are smoothed even further.  Among all of the points of data to the left now, I lost still more ups and downs in my every 5 minutes, and I have only the averages for these intervals of 5 minutes in my 30 minutes of interval data points.

The point is that the further I go back, the pics more and valleys I lose as rollups toning their stop.  So if I do the calculation 95th percentile, over the period of time, I'm comment less than a true representation of the 95th percentile I don't really have.  Because I work off the coast of data where the peaks and troughs have been rounded more for fewer data points.

By LucD, who proposed a way to get the 95th percentile:

https://communities.VMware.com/thread/460129

I can get a rough estimate of the 95th percentile.  However, it appears (correct me if wrong) that I'll be back a month or two or three months or one year that my 95th percentile will be reduced and a balance budget actual 95th percentile and more a 95th percentile of the average instead of a 95th percentile of actual performance data. and probably further from vCOps make account.

Any proposed solutions to this problem?  The goal here is to use PowerCLI for model truly what my 'tip' periods look like for an application of VMs CPU when for example, at the end of the month, everyone makes their treatment.

Although there is no official took in charge methods to extract data from the DB vCOps, it is possible.

Clinton did a post on this, see informal VMware vCenter Operations Powershell Module

And of course, there will be a chapter in vCOps in my next book, that I mentioned earlier

Tags: VMware

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