I am running vCenter 5.5 Update 2b and ESXi hosts running 5.5U2b as well. My task to to upgrade the hosts to U3a - build 3116895-A01. I would like to stage the upgrade prior to patching it, but in the staging dialog, I do not see the upgrade listed. This may be by design based on the reading here - http://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.update_manager.doc/GUID-BEF797B1-318D-46B3-8ACC-18DB5EF71D92.html
. This only mentions staging patches and extensions. Is it possible to stage an upgrade, and if so, how can this be done?