6.5.1

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Preparing to Migrate the Content Library
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Prepare Managed ESXi Hosts for Migration
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Download and Mount the vCenter Server Appliance Installer
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Download and Run VMware Migration Assistant on the Source Windows Machine
Synchronizing Clocks on the vSphere Network
Verify that all components on the vSphere network have their clocks synchronized. If the clocks on the
machines in your vSphere network are not synchronized, SSL certificates, which are time-sensitive, might
not be recognized as valid in communications between network machines.
Unsynchronized clocks can result in authentication problems, which can cause the installation to fail or
prevent the vCenter Server Appliance vpxd service from starting.
Verify that any Windows host machine on which vCenter Server runs is synchronized with the Network
Time Server (NTP) server. See the Knowledge Base article http://kb.vmware.com/kb/1318.
To synchronize ESXi clocks with an NTP server, you can use the VMware Host Client. For information
about editing the time configuration of an ESXi host, see vSphere Single Host Management.
Synchronize ESXi Clocks with a Network Time Server
Before you install vCenter Server or deploy the vCenter Server Appliance, make sure all machines on
your vSphere network have their clocks synchronized.
This task explains how to set up NTP from the VMware Host Client. You can instead use the vicfg-ntp
vCLI command. See the vSphere Command-Line Interface Reference.
Procedure
1 Start the VMware Host Client, and connect to the ESXi host.
2 Click Configure.
3 Under System, click Time Configuration, and click Edit.
4 Select Use Network Time Protocol (Enable NTP client).
5 In the Add NTP Server text box, enter the IP address or fully qualified domain name of one or more
NTP servers to synchronize with.
6 (Optional) Set the startup policy and service status.
7 Click OK.
The host synchronizes with the NTP server.
vSphere Upgrade
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