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| N-to-N configuration | ||
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An N-to-N configuration refers to multiple service groups running on multiple servers, with each service group capable of being failed over to different servers. For example, consider a four-node cluster with each node supporting three critical database instances.
N-to-N configuration
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If any node fails, each instance is started on a different node, ensuring that no single node becomes overloaded. This configuration is a logical evolution of N + 1: it provides cluster standby capacity instead of a standby server.
N-to-N configurations require careful testing to ensure that all applications are compatible. Applications must also have complete control of where service groups fail when an event occurs.