In general, redundancy refers to the duplicate of a system's key functions or components, generally as a backup, in order to increase the system's dependability or performance.
There are four
types of redundancy: hardware, software, time, and information.
Hardware
redundancy is defined as the addition of a duplicate component or device to a
system in order for it to step in during the failure of the original component
or device. Its goal is to ensure that there is no downtime.
The term
"server redundancy" refers to the quantity and intensity of backup or
redundant servers in any computing system. It denotes a computing
infrastructure's capacity to make new servers accessible. These extra servers
can be launched during runtime to ensure backup and load balancing. These can
also be utilized when a primary server has to be temporarily suspended in order
to do maintenance on it. Server redundancy guarantees that there is always a
backup server ready to step in if the primary server fails to provide service.
A redundant
server is not used as a live server and remains offline. However, it is always
ready to respond when called upon and may begin operating with Internet/network
access and power supply.
Replicated servers,
redundant domain, front end, and validation servers, and disaster recovery
servers are all types of redundant servers.
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