A cluster is a group of servers networked together to share the work load. Failover is the process of transferring operation of a failed server to a backup server to ensure websites remain online even due to hardware failure or maintenance. Failover is used to host mission critical websites that require constant availability.
If a server fails, all sites are down, no mail works, incoming mails circulate in queue.
· A cluster system where one operates web and mail, the other databases. Both get mirrored constantly.
· If server A fails, his work is done by server B
· If server B fails, his work is done by server A
· As soon as both are working again, they get mirrored.
· No offline for website and no late mails.
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