question on net time before demoting old servers

Question

at the point where we are going to demote our old 2008r2 DCs and just use 2012.

noticed if we run net time on workstations "some" still point towards the old 2008r2 servers.

is that anything to worry about, or will they update one the two old 2008r2s are removed?

Answer 1

Yes, it does
Type: NT5DS (Local)

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Answer 2

Some general info

• All domain members should use NT5DS domain time.
• Desktops and member servers sync with any domain controller.
• Domain controllers sync with PDC emulator (one per domain)
• PDC emulator in child domain can sync with any domain controller in parent domain.
• PDC emulator in parent domain syncs with either a hardware clock or possibly an external source.
  https://blogs.technet.microsoft.com/nepapfe/2013/03/01/its-simple-time-configuration-in-active-directory/

If the 2012 is the PDC emulator then you can run

w32tm /unregister
net stop w32time
w32tm /register
net start w32time
w32tm /config /manualpeerlist:<external ntp address> /syncfromflags:manual /reliable:yes /update
net stop w32time
net start w32time
then check
w32tm /query /source
w32tm /query /configuration

All others

w32tm /unregister
net stop w32time
w32tm /register
net start w32time
w32tm /config /syncfromflags:domhier /update
net stop w32time
net start w32time
then check
w32tm /query /source
w32tm /query /configuration

--please don't forget to Accept as answer if the reply is helpful--

Answer 3

actually, the PDC (2012) points to the OLD pdc for time (2008r2)any idea why that would happen?  the FSMO roles are all transferred and looks good.

Answer 4

Sounds like it is currently using NT5DS instead of NTP
you can check it (post results)
w32tm /query /source
w32tm /query /configuration

--please don't forget to Accept as answer if the reply is helpful--

Answer 5

got this from the commands: source is one of the 2008r2 servers, see below:

C:\>w32tm /query /source
2008-2.mydomain.com

C:\>w32tm /query /configuration
[Configuration]

EventLogFlags: 2 (Local)
AnnounceFlags: 10 (Local)
TimeJumpAuditOffset: 28800 (Local)
MinPollInterval: 6 (Local)
MaxPollInterval: 10 (Local)
MaxNegPhaseCorrection: 172800 (Local)
MaxPosPhaseCorrection: 172800 (Local)
MaxAllowedPhaseOffset: 300 (Local)

FrequencyCorrectRate: 4 (Local)
PollAdjustFactor: 5 (Local)
LargePhaseOffset: 50000000 (Local)
SpikeWatchPeriod: 900 (Local)
LocalClockDispersion: 10 (Local)
HoldPeriod: 5 (Local)
PhaseCorrectRate: 7 (Local)
UpdateInterval: 100 (Local)

[TimeProviders]

NtpClient (Local)
DllName: C:\Windows\system32\w32time.DLL (Local)