6.5

Passive
The functional state or role of a server when it is not delivering service to clients and is hidden from the
rest of the network.
Pathping
A route-tracing tool that works by sending packets to each router on the way to a nal destination and
displays the results of each hop.
Plug-and-Play (PnP)
A standard for peripheral expansion on a PC. On starting the computer, PnP automatically congures the
necessary IRQ, DMA and I/O address settings for the attached peripheral devices.
Plug-in
An application specic module that adds vCenter Server Heartbeat protection for the specic application.
Pre-Clone
An installation technique whereby the user creates an exact replica of the Primary server using VMware
vCenter Converter or other 3rd party utility prior to the initiation of installation and uses the replica as a
Secondary server.
Pre-Installation Checks
A set of system and environmental checks performed as a prerequisite to the installation of vCenter Server
Heartbeat.
Primary
An identity assigned to a server during the vCenter Server Heartbeat installation process that normally
does not change during the life of the server and usually represents the production server prior to
installation of vCenter Server Heartbeat.
Principal (Public) IP Address
An IP address used by clients to contact the server through drive mappings, UNC paths, DNS resolved
paths, etc., to gain access to the server's services and resources.
Principal NIC
The network card which hosts the Principal IP address.
Principal (Public) Network
The network used by clients to connect to server applications protected by vCenter Server Heartbeat.
Protected Application
An application protected by the vCenter Server Heartbeat solution.
Quality of Service (QoS)
An eort to provide dierent prioritization levels for dierent types of trac over a network. For example,
vCenter Server Heartbeat data replication may have a higher priority than ICMP trac, as the consequences
of interrupting data replication are more obvious than slowing down ICMP trac.
Receive Queue
The staging area on a server used to store changes received from another server in the replication chain
before they are applied to the disk/registry on the passive server.
Remote Desktop Protocol (RDP)
A multi-channel protocol that allows a user to connect to a computer running Microsoft Terminal Services.
Replication
The generic term given to the process of intercepting changes to data les and registry keys, transporting
the changed data across the Channel, and applying them to the passive server(s) so the servers are
maintained in a synchronized state.
Role
The functional state of a server in the vCenter Server Heartbeat Cluster: active or passive.
104 VMware, Inc.
Administrator Guide