6.0.2

Table Of Contents
If you upgrade an external vCenter Single Sign-On and at least one instance of vCenter Server to version 6.0
while leaving other instances of vCenter Server at version 5.5, expect these results:
n
Linked Mode no longer functions.
n
vCenter Server 5.5 instances continue to operate with the upgraded Platform Services Controller as they
did before the upgrade without any problems or required reconguration.
n
In a vCenter Server mixed-version 5.5 and 6.0 environment, a vSphere Web Client 6.0 instance shows
vCenter Server 5.5 instances.
n
vSphere Web Client 5.5 shows vCenter Server instances only, not 6.0 instances.
If you upgrade all vCenter Server 5.5 instances to version 6.0 and the distributed vCenter Single Sign-On
instance to an external Platform Services Controller, none of the vCenter Server instances are aected. They
continue operating with the Platform Services Controller as they did before the upgrade without any
problems or required action.
The only action required for a mixed-version 5.5 and 6.0 environment after upgrade is a restart of any legacy
vSphere Web Client instances if they will be used to view vCenter Server 5.5 instances that are not yet
upgraded.
Figure 16. Example Deployment Before Upgrade Begins
For example, a deployment with three vCenter Server 5.5 instances and two external vCenter Single Sign-On
instances must be upgraded one instance at a time to version 6.0.
Chapter 1 Introduction to vSphere Upgrade
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