Product : Citrix, Citrix Hypervisor/8, Premium
Feature : Hot Add/Plug, VM Config , Hypervisor
Content Owner:  Roman Macek
Summary
Yes (disk, NIC)
Details
Citrix Hypervisor supports adding of disks and network adapters while the vm is running - hot plug requires the specific guest OS to support these functions - please check for specific support with your OS vendor.