Cluster considerations

A cluster is a group of computers linked together in a network that share disk resources in a high-availability environment. The machines in a cluster cooperate to provide a set of services or resources to clients.

In a cluster configuration, if the platform supporting a set of applications fails, the functions of the applications are transferred to a backup platform. This backup (or standby) platform is ready to immediately provide support for the critical application processes normally assured by the principal platform.

In most cluster solutions, when the original platform recovers from failure, it recovers application processes from the secondary system that has temporarily acted as the active system.

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