Copy offload is a new feature (dev preview) primarily for vSphere that utilizes the storage array capabilities to clone VM disks over to OpenShift by performing the copy on the storage array, in contrast to copy over the network.

To use that capability there are few steps to take:
1. set the feature flag under forklift controller feature_copy_offload: "true"
2. install a package on each of the ESX servers on the vSphere env using our own provided ansible playbook 
3. create a StorageMap to map a storageClass, to vsphere data-stores, with the offloadPlugin details (secret and vendor identifier)
4. use the StorageMap from step 3. in the a plan 

2.8.Z