You can also use PowerShell to disable the Time synchronization service. Open Hyper-V Manager, select the DC VM and click Settings….Ĭlick Integration Services and clear the Time Synchronization option check box. To disable (or enable) the Hyper-V time synchronization provider, you can follow the steps shown below. This will enable your guest DC to synchronize time from the domain hierarchy or when the DC holds the PDC Emulator role, to synchronize time from any reliable external time source, like. Windows servers and workstations that are not joined to a domain will synchronize their time, also by default, with .įurthermore, as a best practice recommendation for VMs running as a DC, you should disable time synchronization between the Hyper-V host and the VM itself. The questions to ask are: Is the system time shown by your VM host accurate (i.e. The kernel will sync the hardware clock to the system time automatically every 11 minutes anyway, but thats just to deal with the possibility of a clean shutdown not happening. By default all members of a domain act as a time client, therefore, in most cases it is not necessary to configure the Windows Time Service. The system clock maintained by the kernel is the only one which matters. In AD, we use the Windows Time service (W32time.exe) for time (clock) synchronization with the Network Time Protocol (NTP) as the default time synchronization protocol. If you are running VMware desktop virtualization products on a multiprocessor system in which the timestamp counters (TSCs) do not remain synchronized between all processors, the operating system clock in each virtual machine can perform unpredictably. Other than DCs, member servers running as a virtual machine (VM) can use the Time Synchronization Integration Service to sync time with the Hyper-V host their running on, which in his place syncs time with the domain hierarchy.Īll physical member servers and workstations in turn will sync time with their authenticated DC. All other DCs should sync their time with the DC holding the PDC Emulator role for their child domain. It is a best practice to manually set this server (root domain PDC emulator) to synchronize his time with an external time source on the Internet, like, be. or us. This DC is responsible for the time in the complete AD environment. The PDC emulator DC in the root domain of the AD forest is the authoritative time source for the forest. In the AD domain hierarchy, the PDC emulator DCs of a child domain then synchronizes time with the PDC emulator in its parent domain. The maximum frequency you can achieve is clock / 4, by setting the prescaler to 1. As shown in the picture above, all DCs should synchronize their time with the DC holding the PDC Emulator FSMO role for their domain.
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