Service Manual

VMware is a centralized server management system that manages multiple vSphere operating systems on
which multiple virtual machines (VMs) run. The VMware ESX server is a single unit, that can be managed by
the hypervisor or act as an independent unit. The Citrix Xen hypervisor uses a distributed management
methodology under which a number of XenServers is grouped in a management domain, with a master server
managing the other units in the domain.
Minimal packet drops may be seen when migrating VMS from one server to another. The drops may vary from
one second or higher, depending on the load on the server and network.
Dell Networking OS supports up to eight hypervisor sessions. A hypervisor session can consist of a single
hypervisor unit (ESX, ESXi, XenServer) or a centralized hypervisor (vCenter, Xenpool). To manage a single
VMware hypervisor, use a vSphere client. A vCenter server is a centralized management server for managing
multiple VMware hypervisors.
Figure 2. Virtual Server Networking Example
For any change, VSN subscribes use hypervisor to notify the switch. Depending on the hypervisor mode you
configure, the Dell Networking OS may automatically update its configuration, provide provisioning for
configuration changes, or require system administrator intervention.
Hypervisor Modes
There are two modes for retrieving configuration information from a hypervisor on a virtual server: check and
config.
• Check — VSN retrieves configuration information from a hypervisor and notifies the system
administrator when there is a change in the network configuration; for example, when you add or
Virtual Server Networking 137