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One device status issue

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Hello all,

I have one device (Synology NAS) that I am monitoring over a dedicated IPSec tunnel. Now it usually reports back clean, however no matter how much I try to tweak the interval or anything it'll spit back a down status, and if I click the sensor manually, and click check now, it always returns clean.

My only guess is that cause I have 12 SNMP sensors querying against it that it maybe gets overloaded with the requests and doesn't get a response from all sensors at one time (since half my sensors report a warning, with the system health reporting down). I tried to look to see if there was a way to stagger sensor requests (in that if I have 12 sesnors, and an interval of 15 minutes, I could have each sensor query the device 1 minute apart).

Is this possible, or any other ideas why I'm having this annoying issue?

interval snmp staggered

Created on Jun 18, 2018 4:14:52 PM by  AKDGCM (1) 1



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Hmmm, usually the Synology appliances take SNMP with ease. What sensors do you run against it?


Kind regards,
Stephan Linke, Tech Support Team

Created on Jun 19, 2018 11:57:24 AM by  Stephan Linke [Paessler Support]



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  • 1 SNMP Synology System Health.
  • 1 SNMP logical Volume status
  • 1 SNMP logical volume size
  • 10 SNMP Physical Disc status

Created on Jun 19, 2018 4:35:44 PM by  AKDGCM (1) 1

Last change on Jun 20, 2018 6:02:41 AM by  Stephan Linke [Paessler Support]



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That's okay - how's the ping timing via VPN?


Kind regards,
Stephan Linke, Tech Support Team

Created on Jun 20, 2018 6:03:27 AM by  Stephan Linke [Paessler Support]

Last change on Jun 20, 2018 6:03:40 AM by  Stephan Linke [Paessler Support]



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ICMP response time is 20 ms.

VPN is IPSec based same ISP at source and destination.

This problem is driving me crazy...

Created on Jun 27, 2018 6:35:13 PM by  AKDGCM (1) 1



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Could you try to install another trial of PRTG (perhaps on-site) to see if the behavior occurs there as well?


Kind regards,
Stephan Linke, Tech Support Team

Created on Jun 28, 2018 8:22:39 AM by  Stephan Linke [Paessler Support]



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Just another assumption, is RAID scrubbing active on the Synology? They're currently working on a patch. If scrubbing is active, no SNMP queries are being responded to. Maybe that's the issue? You can verify that via the logs:

2018-06-25T18:00:01+02:00 medelo-backup02 synoraidtool: space_do_data_scrubbing.c:158 failed to enable RMW
2018-06-25T18:00:01+02:00 medelo-backup02 kernel: [ 2663.920000] md: requested-resync of RAID array md2
2018-06-25T19:14:15+02:00 medelo-backup02 kernel: [ 7117.550000] bad rx status 2f86c5fb, (overrun error)
2018-06-26T04:25:01+02:00 medelo-backup02 kernel: [40164.440000] md: md2: requested-resync done.

Created on Jun 28, 2018 12:23:47 PM by  Stephan Linke [Paessler Support]



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I will check that out, thanks! I'll report back my findings.

Created on Jul 4, 2018 5:03:17 PM by  AKDGCM (1) 1



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Thanks! :)


Kind regards,
Stephan Linke, Tech Support Team

Created on Jul 5, 2018 6:13:34 AM by  Stephan Linke [Paessler Support]



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We have updated the Synology NAS to the latest Firmware and I'll report back if this is still an issue or not.

Created on Feb 13, 2019 7:33:18 PM by  AKDGCM (1) 1



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.