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ESXi 4.1 - NTP server change

Hi,

I have 300 production ESXi host in our environment. I am going to change the NTP servers on each Host using script. As precaution, please help me to clear the below doubts.

1- Stop the NTP service on each Host
(Get-VmHostService -VMHost $esx | Where-Object {$_.key -eq "ntpd"} | Stop-VMHostService)

2- Remove the existing NTP server details
(Remove-VmHostNtpServer -NtpServer 192.168.1.5 -VMHost $esx)

3 -Add the new NTP server to the host
(Add-VmHostNtpServer -VMHost $esx -NtpServer servername)

4 - Restart the NTP services
(Get-VmHostService -VMHost $esx | Where-Object {$_.key -eq "ntpd"} | Start-VMHostService)

Please let me know if any impact

1 - Remove NTP server details
2 - Restarting NTP services
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kbjijo
Asked:
kbjijo
1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
There will be no service impact, (in fact ESXi NTP time service is so buggy it stops most of the time anyway for no reason!)

If you are syncing VMware Virtual Machines with the Hosts, via VMware Tools, irrespective of this change, it's probably best to sync Windows Servers with the Active Directory Domain Controllers e.g. PDC and Linux/Unix VMs to an external time source, the same NTP source as the ESXi servers.
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Aravind SivaramanTechnical Subject Matter ExpertCommented:
There wont be any impact on the VM's running...
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frankhelkCommented:
My recommendation:

How about using a Windows port of the classic *ix NTP service ? The NTP service software is free. Easy to install and configure, works like a charm and is stable as a rock. And it is nicer when it comes to one of the rare cases of troubleshooting.

See this article for the "How To".
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