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WMI Logical Disk I/O Sensor - setting free space limit

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I'm trying to set limits for free space on the new (beta) WMI Logical Disk I/O sensor. But it seems that the limit logic is upside-down. What am I missing?

Details: My disk currently has 87% free space. I set the lower warning limit to 50%, the upper warning limit to 30% and the error limit to 10% (in my mind, less free space is bad). However, the sensor immediately shows the disk status as "down". I think it is treating a higher number is "bad" when in fact it is lower numbers that are "bad".

Or is there a trick to setting limits such that higher number are "good" and lower numbers are "bad"? If not, then this is some feedback on the new sensor. Otherwise I love it is replaces several existing separate sensors for me.

disk-io limits wmi-sensors

Created on Sep 26, 2016 5:40:21 PM by  dd-pcfd-ut (0) 1



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Hello, I think you have to set 30% as lower warning limit and 10% as lower error limit

Created on Sep 27, 2016 12:25:13 PM by  Oleg Vorodin (100) 2 1



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Oleg's correct :)

Created on Sep 27, 2016 6:58:49 PM by  Stephan Linke [Paessler Support]



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You should think about limits as about car wheel pressure gauge:

Gauge levelGauge zoneRepresents
Very low and very highRedVery high emergency risk
Medium low and medium high levelYellowWarning about problem
Zone between medium low and medium high levelGreenThat's all OK

Created on Sep 27, 2016 7:30:58 PM by  Oleg Vorodin (100) 2 1

Last change on Sep 28, 2016 8:07:26 AM by  Sebastian Kniege [Paessler Support]



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Thank you. I see now that the root cause was that I didn't scroll down in the "Edit Channel" window, and did not see the lower error limit box. So I misinterpreted the upper and lower warning limits.

It makes much more sense now.

Created on Sep 27, 2016 9:30:23 PM by  dd-pcfd-ut (0) 1



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Thank you Oleg,

we appreciate your metaphor, its a great explanation for limits.

What you've described would look somewhat like the following in PRTG:




Best regards,
Sebastian

Created on Sep 28, 2016 11:04:45 AM by  Sebastian Kniege [Paessler Support]



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Greetings all, the explanation on how to set limit is made clear to me with this demonstration, pls kindly givem me a screen shot on how to set this limit on the channel IDs with the corresponding figures. how did you do this?

Created on Dec 8, 2016 2:58:00 PM by  Frank Uchehara (0) 1



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Dear Frank,

May I kindly ask to further clarify what you mean by "corresponding figures"? What is unclear after looking at PRTG's definition of channel limits?

Best,
Sebastian

Created on Dec 9, 2016 8:17:01 AM by  Sebastian Kniege [Paessler Support]



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Hello Sebastin,

it was difficult for me to undertand the Lower Warning Limit, Lower Error Limit, Upper Warning Limit and Upper Error Limit terminology and when and which to apply to a particular sensor, from the figure above I was able to understand the concept using this technique, assuming the parameters I mentioned above stands for LWL and LEL, UWL and UER, if you place them on the analogue meter above as it appears on the Tire Pressure Gauge Sensor, LEL = Yellow, LWL =Red and UWL stands for Yellow, UEL stands for Red, while the Green stands for 'Best Performance' level..... what of a situation when we don't need to define the entire 4 parameters like LEL and LWL, UWL and UER, what of an Exchange Server sensor like MSExchangeIS: Active User Count, MSExchangeIS: RPC Requests, SMTP name them just like Sensors that requires two states up is good while down is bad or UP is Bad while down is good?

Thank you.

Created on Dec 10, 2016 8:57:29 AM by  Frank Uchehara (0) 1



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Dear Frank,

Thank you for your clarification. You don't have to define the four different limits at once. If you just need one or two different states you are free to define them.

The following example displays the channel limits of a WMI Free Disk (Multi Disk) sensor. As you can see there is just a lower warning limit and a lower error limit defined.

WMI Free Disk Space Sensor w/ Limits

Best,
Sebastian

Created on Dec 12, 2016 1:46:12 PM by  Sebastian Kniege [Paessler Support]



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