If you upgrade vSphere components separately from Horizon 7 components, you must back up some Horizon 7 data and reinstall some Horizon 7 software.
Instead of performing an integrated upgrade of Horizon 7 and vSphere components, you can choose to first upgrade all Horizon 7 components and then upgrade vSphere components, or the reverse. You might also upgrade only vSphere components when a new version or update of vSphere is released.
When you upgrade vSphere components separately from Horizon 7 components, you must perform the following additional tasks:
Before you upgrade vCenter Server, back up the vCenter Server database and the View Composer database.
Before you upgrade vCenter Server, back up the Horizon LDAP database from a Horizon Connection Server instance by using the vdmexport.exe utility.
For instructions, see the Horizon 7 Administration document. If you have multiple instances of Connection Server in a replicated group, you need to export the data from only one instance.
If you use View Composer, after you upgrade all ESXi hosts that are managed by a particular vCenter Server instance, restart the View Composer service on that host.
After you upgrade VMware Tools in virtual machines that are used as remote desktops, reinstall Horizon Agent.
Reinstalling Horizon Agent guarantees that the drivers in the virtual machine remain compatible with the other Horizon 7 components.
Step-by-step instructions for running the Horizon Agent installer appear in the Setting Up Virtual Desktops in Horizon 7 document.