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Volume usage on Synology NAS?

Thu Jan 27, 2022 5:28 pm

Have Dude installed just few days ago, I like it, but still learning myself on how to use it.
I have Synology NAS in my network, and I have noticed disk usage is indicated wrong on the label.
The Dude reports 46% usage, but Synology OS reports 69%, see screenshot.
Did not really understand yet how things work in Dude, but seems like Dude's function hdd_usage() returns wrong value for Synology...
See picture for device label.

Are there any way how to fix it?
p.s. Have only one volume on Synology.
usage1.png
usage.png
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bpwl
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Re: Volume usage on Synology NAS?

Thu Jan 27, 2022 6:26 pm

Complex thing to capture in one % number. What disk is presented here?

Maybe check details and make the sums ...

SNMPWalk gives: (volumes are 54,55,56 in my case)
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Klembord-3.jpg
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Klembord-2.jpg
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Re: Volume usage on Synology NAS?

Thu Jan 27, 2022 9:54 pm

Complex thing to capture in one % number. What disk is presented here?
Maybe check details and make the sums ...
Do not really sure I had understood you...
Your point is: disk_usage() function is not applicable for NASes and I need to use some Synology-specific snmp oid staff, is this correct?
 
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bpwl
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Re: Volume usage on Synology NAS?

Thu Jan 27, 2022 10:48 pm

YES

I don't know what device_performance () collects. What is the disk value that is used? And memory? It does not seem to be related to the NAS volumes?
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Klembord-3.jpg
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In the NAS itself I find no correlation with the shown values for memory and disk.
Nothing seems to explain the values: AHA found it:
This function shows the % usage for the filesystem "/" , not for the mounted file system "/volume1". In OID under number ending on 31, not numbers 54,55 and 56
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Klembord-2.jpg
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The values in the OID are correct for all the mounted file systems, and there are many of them (even more detail than in the GUI)
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Klembord-4.jpg
Copying OID and put it in the label is simple .... viewtopic.php?t=145586#p903768
Attention: Edit the ".3.6" to the correct "1.3.6"
I hope there are enough functions in DUDE to do some math on the values.

Nice presentation on DUDE: https://mum.mikrotik.com/presentations/HU11/patrik.pdf
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Re: Volume usage on Synology NAS?

Sat Jan 29, 2022 3:07 am

This function shows the % usage for the filesystem "/" , not for the mounted file system "/volume1". In OID under number ending on 31, not numbers 54,55 and 56
...
I hope there are enough functions in DUDE to do some math on the values.
Thaks a lot! Cannot say I've got everything but will try work to understand :-). Will play on the weekend.
 
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Re: Volume usage on Synology NAS?  [SOLVED]

Sat Jan 29, 2022 5:14 am

found it:
This function shows the % usage for the filesystem "/" , not for the mounted file system "/volume1". In OID under number ending on 31, not numbers 54,55 and 56
Wow! :lol: Seems like I have done it! Thank you again!
In my case I've used index .51 for "/volume", works for both my NASes.
Finally, label is: "Volume Usage: [round(oid("1.3.6.1.2.1.25.2.3.1.6.51")/oid("1.3.6.1.2.1.25.2.3.1.5.51")*100)]%"

VolumeUsage.png

Only one minor question, seems like round() function is not working correctly, with no rounding I have something like 43.77bla-bla-bla, with rounding it gives me 43, but I am expecting 44...
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bpwl
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Re: Volume usage on Synology NAS?

Sat Jan 29, 2022 1:07 pm

No idea how "round" is implemented. If it is just "taking integer value", then in programming one tweaks it with things like [multiplying with 100 , adding 0.5, INT, divide by 100] to have rounded on 2 decimals.

Thanks for the label written out. Just copied it !
Klembord-2.jpg
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Re: Volume usage on Synology NAS?

Sat Jan 29, 2022 8:32 pm

Thanks for the label written out. Just copied it !
JFYI, have modified labels to fix rounding and to show total volume size...

Here is the label: Volume Usage: [round(0.5 + oid("1.3.6.1.2.1.25.2.3.1.6.51")/oid("1.3.6.1.2.1.25.2.3.1.5.51")*100)]% of [round(0.5 + oid("1.3.6.1.2.1.25.2.3.1.5.51")/1048576/1048576 * oid("1.3.6.1.2.1.25.2.3.1.4.51") * 10) / 10]TB

Here how it looks like:
VolumeUsage1.png
P.S. What does first line report: [device_performance()][Device.ServicesDown] ?
I did not see any relevant parameter, seems like it does not really informative in case of Synology NASes...
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bpwl
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Re: Volume usage on Synology NAS?

Sat Jan 29, 2022 9:22 pm

[device_performance()]---> found in functions (double click, or right-click/settings)
[Device.ServicesDown]---> probably comes from probes/services

Klembord-2.jpg
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Klembord-3.jpg
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Klembord-4.jpg
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Klembord-5.jpg
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etc etc etc etc
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Services checked (list made with "Discover")
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Klembord-8.jpg
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