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How do i calculate the disk IO value from DiskTransfersPersec

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Hi,

I want to create a custom sensor which includes a channel with the same value calculations that PRTG gets from the builtin WMI Logical Disk , DiskTransfersPersec. Here are the log from the output of this sensor:

SELECT Name,DiskTransfersPersec,Timestamp_Perftime,Frequency_PerfTime FROM win32_perfrawdata_perfdisk_logicaldisk WHERE Name = 'xxxxx'
DiskTransfersPersec: 1637361, 1669085, 1669085, 1669087, 1669087, 1669089
Timestamp_Perftime: 2213083418143, 2213484469961, 2213683213930, 2214283208790, 2214303262986, 2214883263939
Frequency_PerfTime: 10000000
Value: 1245.04612144818, 791.019977373597, 0, 0.0333336188913352, 0, 0.0344827019620432

I would like to know how PRTG calulates the output values so i can use the same calculations in my custom script. I want to fetch data from win32_perfrawdata_perfdisk_logicaldisk but as we can see DiskTransfersPersec differs from the output value. Some magic is happening here to calculate the value i dont understand!

The reason for this is that the output value represent the exact IO value i get from Iometer when running tests, and it correctly represents the IO i want to display in PRTG custom sensor.

disk-io wmi wmi-custom-sensor

Created on May 15, 2015 9:28:31 AM by  grytulv (0) 1

Last change on Jan 29, 2018 12:11:12 PM by  Luciano Lingnau [Paessler]



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Sorry, that's considered corporate secret ;) You have to figure it out on your own:

https://msdn.microsoft.com/en-us/library/aa392761%28v=vs.85%29.aspx

Created on May 18, 2015 12:35:34 PM by  Stephan Linke [Paessler Support]



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