6.5.1

Table Of Contents
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For a mixed-platform installation with vCenter Single Sign-On 5.5 appliances or
Platform Services Controller 6.0 appliances and vCenter Server instances on Windows, upgrade all
the vCenter Single Sign-On 5.5 appliances or Platform Services Controller 6.0 appliances before
upgrading or migrating any vCenter Server instances on Windows.
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After upgrading or migrating your vCenter Single Sign-On 5.5 instances or
Platform Services Controller 6.0 instances, you can upgrade vCenter Server instances.
vCenter Server instances that point to the same Platform Services Controller can be upgraded or
migrated concurrently.
When you upgrade an externally deployed vCenter Single Sign-On 5.5 instance or
Platform Services Controller 6.0 instance to an externally deployed Platform Services Controller 6.5
instance, the legacy vCenter Server instances that were using the component are not affected. The
legacy vCenter Server instances continue to operate with the upgraded Platform Services Controller just
as they operated before the upgrade without any problems or required reconfiguration. Legacy
vCenter Server instances continue to be visible to the legacy vSphere Web Client, though vCenter Server
6.5 instances are not visible to the legacy vSphere Web Clients.
Transitional behavior during a migration from a vCenter Server deployment on Windows to an appliance
deployment is the same as for a vCenter Server upgrade on Windows.
Mixed-version transitional behavior is the same for vCenter Single Sign-On instances deployed in
vCenter Server 5.5 for Windows environments and in vCenter Server Appliance environments.
Figure 14. Mixed-Version 5.5 and 6.5 Transitional Environment
Important Mixed-version environments are not supported for production. Use these environments only
during the period when an environment is in transition between vCenter Server versions.
If you upgrade an external vCenter Single Sign-On 5.5 and at least one instance of vCenter Server to
version 6.5 while leaving other instances of vCenter Server at version 5.5, expect the following behavior:
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Linked Mode no longer functions.
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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 reconfiguration.
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In a mixed-version 5.5 and 6.5 environment, a vSphere Web Client 6.5 instance shows
vCenter Server 5.5 instances.
vSphere Upgrade
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