CompTIA Network+ Certification Object Security Descriptors accessible to multiple machines
The most common contexts in which a failover cluster might be used are with mcts certification applications and components such as the following: _N SQL Server _N Domain controllers _N Exchange servers _N Custom applications _N Mission-critical roles Clustering Components Within a cluster, you need to be familiar with two components: _N Server nodes _N Shared storage Server Nodes Within a server cluster, a node is an individual machine that performs a function in the overall picture of the cluster. Within a cluster, there are usually several nodes or individual servers. But at minimum, a cluster must contain two nodes to be considered a cluster. With- out two nodes, there would be only one centralized machine. Shared storage refers to space that is allocated at a location that is accessible to multiple machines throughout the infrastructure. Within a cluster, this is usually a form of network- attached storage, iSCSI, Fibre Channel, or another space for of?oaded data that is acces- sible by all nodes throughout the server. With Windows Server 2008, Microsoft faced several challenges in creating a safe, reliable operating system that supported a highly complex system of backups and redundancy. Its customers demanded a system that not only worked but also supported multiple mcts 70-680 clustering Configurations with a failover system that was second to none. Microsoft’s response was to create a 64-bit capable failover system that could take advantage of TCP/IP versions 4 and 6, support up to 16 nodes, and establish an unparal- leled series of criteria for determining server availability. One of the ways of the Windows Server 2008 clustering failover architecture improved upon the previously existing Windows Server 2003 platform was through the introduction of Windows Server 2008 quorums. When used with reference to human beings, the word quorum is de?ned as ?the number of members of a group or organization required to be present to transact business legally, usually a majority?(Source: Random House Unabridged Dictionary.
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