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System Time on VMs

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We have a vSphere5 shop with ESXi5 hosts and vCenter5.    I'm not familiar with version 5 so I rely on the existing administrators to get my information on how the group works virtualization projects.

 

Recently, I have discovered something I feel is very unusual...at least, from what I've seen in the past.    Our ESX hosts have their system clocks updated by domain controllers that are virtual machines.   I have never seen this before.  Normally, I see ESX host use Atomic clocks directly vs other VMs under them that are being used as NTP servers.    We have 3 Domain Controllers.   One is a physical server and the other 2 are VMs.  The PDC FSMO role resides on one of the VMs.   Note: none of our VMs are syncing with the ESX hosts they are on.   I don't see an issue with that since the hosts fall back to the VMs that are set to be NTP servers.  It just seems odd to me and I wonder if some of our time synchronization issues across the Virtual Infrastructure is caused by this configuration.

 

Thanks


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