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・ Cluster root
・ Cluster sampling
・ Cluster school
・ Cluster Shared Volumes
・ Cluster Springs, Virginia
・ Cluster state
・ Cluster straddling
・ Cluster theory
・ Cluster, Pleasants County, West Virginia
・ Cluster-aware application
・ Cluster-expansion approach
・ Cluster-weighted modeling
・ Clusterball
・ Clustered file system
・ Clustered planarity
Clustered web hosting
・ ClusterFlunk
・ Clusterin
・ Clustering
・ Clustering (demographics)
・ Clustering coefficient
・ Clustering high-dimensional data
・ Clustering illusion
・ Clustering of self-propelled particles
・ ClusterKnoppix
・ Clusterpoint
・ Clusters School of Digital Arts
・ Clustrix
・ Clutag Press
・ Clutch


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Clustered web hosting : ウィキペディア英語版
Clustered web hosting

Clustered hosting is a type of web hosting that spreads the load of hosting across multiple physical machines, or node, increasing availability and decreasing the chances of one service (e.g., FTP or email) affecting another (e.g., MySQL). Many large websites run on clustered hosting solutions, for example, large discussion forums will tend to run using multiple front-end webservers with multiple back-end database servers.
Typically, most hosting infrastructures are based on the paradigm of using a single physical machine to host multiple hosted services, including web, database, email, FTP and others. A single physical machine is not only a single point of failure, but also has finite capacity for traffic, that in practice can be troublesome for a busy website or for a website that is experiencing transient bursts in traffic.
By clustering services across multiple hardware machines and using load balancing, single points of failure can be eliminated, increasing availability of a website and other web services beyond that of ordinary single server hosting.〔(【引用サイトリンク】title=Clustered Web Hosting )〕 A single server can require periodic reboots for software upgrades and the like, whereas in a clustered platform you can stagger the restarts such that the service is still available whilst still upgrading all necessary machines in the cluster.
Clustered hosting is similar to cloud hosting, in that the resources of many machines are available for a website to utilize on demand, making scalability a large advantage to a clustered hosting solution.
==See also==

* High-availability cluster

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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