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Chapter 7
Planning for High Availability
13
Computer Networking
Undergraduate 3
07/09/2012

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Term
application resilience
Definition
The ability of an application to maintain its own availability by detecting outdated, corrupted, or missing files and automatically correcting the problems.
Term
convergence
Definition
In network load balancing, a process in which a server is excluded from the cluster after it fails to generate five consecutive heartbeat messages
Term
DNS Round Robin
Definition
A load-balancing technique in which you create an individual resource record for each terminal server inthe server in the server farm using the server's IP address and the name of the farm (instead of the server name).
When clients attempt to stablish a Terminal Services connection to the farm, DNS distributes the incomming name resolution requests among the IP addresses.
Term
failover cluster
Definition
A collection of redundant servers configured to perform the same tasks so that if one server fails, anothe server can take its place almost immediately.
Term
heartbeats
Definition
In network load balancing, messages exchanged by cluster nodes to indicate their continued operation.
Term
Network Load Balancing (NLB)
Definition
A clustering technology in which a collection of identical servers run simultaneously, sharing incoming traffic equally among them.
Term
Offline Files
Definition
A Windows feature that enables client computers to maintain copies of server files on their local drives. If the computer's connection to the network is severed or interrupted, the client can continue to work with the local copies until network service is restored, at which time the client synchronizes its data with the data on the server.
Term
server farm
Definition
A collection of identical servers used to balance a large incoming traffic load.
Term
Shadow Copies
Definition
A Windows Server 2008 feature that maintains a library containing multiple versions of selected files. Users can select a version of a file to restore as needed.
Term
terminal server farm
Definition
A group of at least two servers running the Terminal Service Role, working together to share a client load
Term
TS Session Broker
Definition
A Terminal Service role service that maintains a database of client sessions and enables a disconnected client to reconnect to the same terminal server.
Term
Windows Installer 4.0
Definition
A Windows Server 2008 component that enables the system to install software packaged as files with a .msi extension.
Term
witness disk
Definition
In failover clustering, shared storage medium that holds the cluster configuration database.
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