6.6

Network Monitoring
Monitoring the ability of the active node to communicate with the rest of the network by polling defined
nodes across the network at regular intervals.
Pair
See vCenter Server Heartbeat Pair above.
Passive
The functional state or role of a node 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 final 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 configures the
necessary IRQ, DMA and I/O address settings for the attached peripheral devices.
Plug-in
An application specific module that adds vCenter Server Heartbeat protection for the specific application.
Pre-Clone
An installation technique whereby the user creates an exact replica of the Primary node using VMware
vCenter Converter or other 3rd party utility prior to the initiation of installation and uses the replica as a
Secondary node.
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 node during the vCenter Server Heartbeat installation process that normally does
not change during the life of the node and usually represents the production node prior to installation of
vCenter Server Heartbeat.
Protected Application
An application protected by the vCenter Server Heartbeat solution.
Public IP Address
An IP address used by clients to contact the node through drive mappings, UNC paths, DNS resolved
paths, etc., to gain access to the node's services and resources.
Public NIC
The network card which hosts the Public IP address.
Public Network
The network used by clients to connect to node applications protected by vCenter Server Heartbeat.
Quality of Service (QoS)
An effort to provide different prioritization levels for different types of traffic over a network. For example,
vCenter Server Heartbeat data replication may have a higher priority than ICMP traffic, as the consequences
of interrupting data replication are more obvious than slowing down ICMP traffic.
Receive Queue
The staging area on a node used to store changes received from another node in the replication chain
before they are applied to the disk/registry on the passive node.
Remote Desktop Protocol (RDP)
A multi-channel protocol that allows a user to connect to a computer running Microsoft Terminal Services.
100 VMware, Inc.
vCenter Server Heartbeat Administrator's Guide