6.0.2

Table Of Contents
3 Verify that the load balancer is correctly congured based on recommendations in vCenter Server 6.0
Deployment Guide.
Prepare ESXi Hosts for vCenter Server Upgrade
Before upgrading to vCenter Server 6.0, you must prepare your ESXi hosts.
Prerequisites
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To upgrade vCenter Server, your ESXi hosts must be at version 5.x. If your ESXi hosts are at an earlier
version than 5.0, upgrade them to 5.x. Read and follow all best practices when upgrading your hosts to
ESXi 5.x.
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For vCenter Server Appliance upgrade to version 6.0, your target host must be running ESXi 5.1 or later.
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For vCenter Server Appliance upgrade to version 6.0, the source and target ESXi hosts must not be in
lockdown or maintenance mode.
Procedure
1 To keep your current SSL certicates, back up the SSL certicates that are on the vCenter Server system
before you upgrade to vCenter Server 6.0.
The default location of the SSL certicates is %allusersprofile%\Application Data\VMware\VMware
VirtualCenter.
2 If you have Custom or Thumbprint certicates, see “Host Upgrades and Certicates,” on page 65 to
determine your preparatory steps.
3 If you have vSphere HA clusters, SSL certicate checking must be enabled.
If certicate checking is not enabled when you upgrade, vSphere HA fails to congure on the hosts.
a Select the vCenter Server instance in the inventory panel.
b Select the Manage tab and the General subtab.
c Verify that the SSL  eld is set to vCenter Server requires  host SSL .
Your ESXi hosts are ready for vCenter Server upgrade.
vSphere Upgrade
64 VMware, Inc.