Creating and recomposing linked clone desktops will fail on Horizon view 6.1.x and all older releases after upgrading to vSphere 6.0 Update 1.
The Linked Clone desktop appears to be created on vCenter, but it will be deleted soon after vCenter complains about either “disposable” or “internal” vmdk files this desktop.
All older versions of Horizon View Composer prior to Horizon 6.2 require SSL v3 to communicate with ESXi hosts, however the SSL v3 has been disabled in ESX6i Update 1 hosts.
Please read this KB article for further information: Upgrading to vSphere 6 update 1 will cause Linked Clone pool creation and recompose failure with Horizon View 6.1.x and older releases (2133018)
Any updates to this information will be made in the KB article itself.