6.6

Table Of Contents
Glossary
Active
The functional state or role of a node when it is visible to clients through the network, running protected
applications, and servicing client requests.
Alert
A notification provided by vCenter Server Heartbeat sent to a user or entered into the system log indicating
an exceeded threshold.
Active Directory (AD)
Presents applications with a single, simplified set of interfaces so users can locate and use directory
resources from a variety of networks while bypassing differences between proprietary services. vCenter
Server Heartbeat failovers require no changes to AD resulting in failover times typically measured in
seconds.
ActivePassive
The coupling of two nodes with one node visible to clients on a network and providing application service
while the other node is not visible and not providing application service to clients.
Advanced Configuration and Power Interface (ACPI)
A specification that dictates how the operating system can interact with the hardware especially where
power saving schemes are used.The Primary and Secondary nodes must have identical ACPI compliance.
Asynchronous
A process whereby replicated data is applied (written) to the passive node independently of the active
node.
Basic Input/Output System (BIOS)
The program a personal computer's microprocessor uses to get the computer system started after you
turn it on. It also manages data flow between the computer's operating system and attached devices such
as the hard disk, video adapter, keyboard, mouse, and printer.
Cached Credentials
Locally stored security access credentials used to log into a computer system when a Domain Controller
is not available.
Channel Drop
An event in which the dedicated communications link between nodes fails, often resulting in the passive
node becoming active and consequently creating a split-brain syndrome.
Channel NIC (Network Interface Card)
A dedicated NIC used by the VMware Channel.
Checked
The status reported for user account credential (username/password) validation.
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