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NetApp NTP

Posted on 2012-12-31
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We recently started to receive error alerts from our NetApp monitoring services saying that our NetApp is not NTP synchronized with any peer, so it's time may be incorrect. It says:

NTP is running, but no peers have passed the selection process. The local time may be too far off; or the configured NTP peers may not be reachable.

I check the ntp.conf to ensure valid time servers are listed, I also turned ON/OFF "options timed.enable".

Next, I looked into this article: https://kb.netapp.com/support/index?page=content&actp=LIST&id=S:1012660

After following all the instructions, I was able to see the error message that might be truly the root cause of the problem: I think it says the NTP server is reachable, but it was rejected by the following reason:

It says flash=400 not_proventic.

At this point I'm stuck and not sure how to proceed further. Any help would be greatly appreciated.
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Question by:pzozulka
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FilipZahradnik earned 2000 total points
ID: 38733898
What version of ONTAP are you using?
What NTP server(s) are you syncing with?

NTP functionality has been changed substantially in ONTAP 8. In some configurations, a Windows domain controller may not be considered a suitable timesource.

These might help:

How to determine if a Windows Domain Controller is a suitable NTP server for Data ONTAP 8
https://kb.netapp.com/support/index?page=content&id=1013468

How to verify NTP operation in Data ONTAP 8
https://kb.netapp.com/support/index?page=content&id=1010058
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by:pzozulka
ID: 38741360
We are running 8.1 7-mode.

We are trying to sync with our domain controller which has the role PDC emulator.

I tried running the command ntpq -p <ip of NetApp management port>
And get results which indicate reach=377 meaning there are no communication problems, however it is getting rejected as an NTP peer.
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by:FilipZahradnik
ID: 38742037
Did you manage to have a look at this article:

How to determine if a Windows Domain Controller is a suitable NTP server for Data ONTAP 8
https://kb.netapp.com/support/index?page=content&id=1013468

It describes an issue where a DC might be rejected as a time source because it does not offer the required accuracy.
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by:pzozulka
ID: 38742106
That setting is only applicable if using the local CMOS clock of the DC -- which in our case we aren't. Our DC uses an external internet time source.
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by:FilipZahradnik
ID: 38742887
Interesting.

As a troubleshooting step, you can try to sync directly with the external NTP source.

If that works, then the issue is likely related to the fact that your time source is a Windows DC. If if fails, then the issue is probably an NTP or ONTAP problem, in which case NetApp Support should be able to help.
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by:pzozulka
ID: 38745407
Can't sync directly because our NetApps are on an internal VLAN which doesn't have access to outside world.
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by:FilipZahradnik
ID: 38745416
Ok, can you try syncing with another internal NTP that is not a Windows DC - e.g. a Cisco router?
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by:pzozulka
ID: 38745787
I am able to connect to other time sources. By the way, it magically started working...out of the blue.

I'm really stumped.
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by:FilipZahradnik
ID: 38757945
Aaah, the joys of random tinkering... :)

Well done.
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