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A cluster represents a group of servers seen as a single one to obtain more power and availability.

Several architectures exist, the most common being the so-called "active/active" one in which each server is permanently ready to work. This architecture requires a load distribution that can be static or dynamic. Requests are then distributed according to precise rules (static) or according to a scheduling algorithm (dynamic).

The deployment of clusters includes notions of fault tolerance such as the transfer of a server's process in the event of its failure, or the ability to integrate servers into a cluster without having to restart it completely.

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