VMware HCX Bulk Migration, This migration method uses the VMware vSphere Replication protocols to move the virtual machines to a destination site. Bulk migration uses the host-based replication to move a virtual machine between HCX data centers. VMware HCX streamlines application migration, workload rebalancing and. Migration Types · This option is designed for moving many (up to 100) VMs at the same time. HCX migration types# · Cold Migration (offline)# · vMotion (no downtime)# · HCX Bulk Migration (low downtime)# · Cloud Motion with vSphere Replication (no.