What is a redundant server?

Consequently, what is the mean of redundancy?

Redundancy is a system design in which acomponent is duplicated so if it fails there will be a backup.Redundancy has a negative connotation when the duplicationis unnecessary or is simply the result of poorplanning.

Subsequently, question is, what is a failover server? Failover is a backup operational mode in whichthe functions of a system component (such as a processor,server, network, or database, for example) are assumed bysecondary system components when the primary component becomesunavailable through either failure or scheduled downtime.

Similarly one may ask, what is the difference between failover and redundancy?

Failover is having redundancy built intothe environment, so that if a server fails, another server takesits place. Another failover method is to have additionalhardware that is being used as a backup for this purpose but is notbeing used while the primary server is up and running(active/passive approach).

What are two advantages of redundant systems?

While the main advantage of replication is theability to split the read load across multiple servers, thisadvantage causes additional overhead in terms of servermanagement. Replication also offers scalability on read operationsand, with proper design, scalability on write operations, withincertain limits.