Time Sync - DHCP Failover - 1 minute difference - How to avoid problems?

I have 2 WIn2012R2 servers with DHCP installed, domain members and clocks synched via AD normal operation
I´ve configured the first DHCP Server and i´m worried about a possible problem, because the DHCP Servers have to be, almost-perfect time sync to operate properly
Can I configure a scheduled task to regularly force the time sync ?
If yes, using "net time" or "w32tm"?
"...If the time difference between the servers is greater than one minute, the failover setup process will halt with a critical error
instructing the administrator to synchronize the time on the servers...."
http://technet.microsoft.com/en-us/library/hh831385.aspx

Well the built-in sync mechanism should be enough. Most of the time, as long as the machines have the same time source (DCs in your case) they shouldn't drift more than one minute apart.
You can use w32tm /monitor /computers:<dhcp1>,<dhcp2> to verify the current time synchronisation remotely. Or even w32tm /stripchart if you want to see something more graphic with the current offset on the servers.
Ultimately, w32tm /resync is the way to force sync.
Why not
enabling the log on the w32tm service for couple of days/weeks and check if you see anything wrong?
Are they virtual machines? If no, nothing to add :)

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Hi!
I'm syncronizing a sbRIo with a time server as described here:
http://digital.ni.com/public.nsf/allkb/F2B057C72B537EA2862572D100646D43?OpenDocument
I've a couple of questions:
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p.s. sorry for cross-posting (http://forums.ni.com/t5/Real-Time-Measurement-and/sbRIo-time-sync-with-SNTP-server/m-p/1951123),
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Solved!
Go to Solution.

Hi Marco,
1) If the SNTP time server becomes unreachable, the cRio will update the local time independently, starting from the last time value get from the server
2) You are right, it doesn't work properly. The right way to express the SNTP source is using IP address
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Hi all;
As you know, the check for time sync is based on the registry value configured for permissible time difference. Can anyone know where this registry value?
Thanks
Please VOTE as HELPFUL if the post helps you and remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
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Hello,
do you talk about the MinPollIntervall and MaxPollIntervall?
https://msdn.microsoft.com/en-us/library/cc246923.aspx
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://blogs.msmvps.com/MWeber
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.
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How to test Windows 2012 R2 DHCP Failover without shutting down the service?

How can I test the Win2012R2 DHCP Failover?
There is a command or script, that i could use to test if DHCP failover is working properly?
How to monitor the sync of the objects?
How to make sure that it will do the job, if required?
Or i have to really stop DHCP server main server and see the failover?

Hello,
you have to keep in mind that this has ONLY effect for machines that request during the downtime a lease. So if your lease time is for example 8 hours a computer will ask after 4 hours for the renewal of the lease.
Means there is no problem for running machines during the test. You just need a computer to start after the service is shutdown on the first DHCP server, should take only some minutes to check if the fail over works. Then you could already start the service
again if you see the lease on the new server.
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Meinolf Weber
MVP, MCP, MCTS
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My Blog: http://blogs.msmvps.com/MWeber
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.
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Time Sync - DHCP Failover - 1 minute difference - How to avoid problems?

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