6.5

System State
Data that comprises the registry, COM+ Class Registration database, les under Windows File Protection,
and system boot le; other data may be included in the system state data.
Task
An action performed by vCenter Server Heartbeat when dened conditions are met.
Time-To-Live (TTL)
The length of time that a locally cached DNS resolution is valid. The DNS server must be re-queried after
the TTL expires.
Traceroute
A utility that records the route through the Internet between your computer and a specied destination
computer.
Ungraceful (Unclean) Shutdown
A shutdown of vCenter Server Heartbeat resulting from a critical failure or by shutting down Windows
without rst performing a proper shutdown of vCenter Server Heartbeat, resulting in possible data loss.
Unprotected Application
An application not monitored nor its data replicated by vCenter Server Heartbeat.
vCenter Server Heartbeat
The core replication and system monitoring component of the vCenter Server Heartbeat solution.
vCenter Server Heartbeat Packet Filter
The network component, installed on all servers, that controls network visibility.
vCenter Server Heartbeat Pair
Describes the coupling of the Primary and Secondary server in a vCenter Server Heartbeat solution.
vCenter Server Heartbeat Plug-ins
Optional modules installed into a vCenter Server Heartbeat server to provide additional protection for
specic applications.
vCenter Server Heartbeat Switchover/Failover Process
A process unique to vCenter Server Heartbeat in which the passive server gracefully (switchover) or
unexpectedly (failover) assumes the role of the active server providing application services to connected
clients.
Virtual Private Network (VPN)
A private data network that makes use of the public telecommunication infrastructure, maintaining privacy
through the use of a tunneling protocol and security procedures.
VMware Channel
The IP communications link used by the vCenter Server Heartbeat system for the heartbeat and replication
trac.
VMware License Key
The key obtained from the VMware that allows the use of components in vCenter Server Heartbeat; entered
at install time, or through the Congure Server Wizard.
Windows Management Instrumentation (WMI)
A management technology allowing scripts to monitor and control managed resources throughout the
network. Resources include hard drives, le systems, operating system settings, processes, services, shares,
registry settings, networking components, event logs, users, clusters, and groups.
106 VMware, Inc.
Administrator Guide