vSphere Migration:
Updating to a newer version of software
Upgrade an ESXi host to ESXi 6.0 or later
Synchronize the clocks of all virtual machines on the vSphere network.
1 Start the vSphere Client, and connect to the ESXi host.
2 On the Configuration tab, click Time Configuration.
3 Click Properties, and click Options.
4 Select NTP Settings.
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