The main service running on the vCenter Server is known as
vpxd or VMware Virtual Server service. When an ESXi host is added to the vCenter Server, there is an agent service called
vpxa, which is installed and started on the ESXi host.
Vpxa acts as an intermediary service between the
vpxd service running on the vCenter Server and hostd service running on the ESXi host. The
hostd service running on the ESXi host is mainly responsible for managing most of the operations on the host.
It knows all the registered virtual machines, their status, and the storage volumes that are visible to the host. When commands such as creating, migrating, or suspending a virtual machine from vCenter Server is issued, ...