(also redundant server, server replication)
Server redundancy definition
Server redundancy is a technique employing numerous servers to hold identical data and execute the same tasks, guaranteeing uninterrupted service operations in the event of a server malfunction. Server redundancy minimizes downtime risks, boosts fault tolerance, and elevates system performance through the distribution of workloads among several servers.
See also: data center rack
Server redundancy examples
- Load balancing: Distributing network traffic across multiple servers to ensure that no single server is overwhelmed, thereby increasing system performance and reliability.
- Failover: A backup server takes over when the primary server fails, minimizing downtime and service disruption.
- Mirroring: Creating real-time copies of data across multiple servers, ensuring that the same data is available on all servers for quick recovery during a failure.
Server redundancy vs. backup
Server redundancy and backups serve different purposes. Redundancy aims to maintain service availability and minimize downtime, whereas backups are a means of data recovery in case of data loss or corruption. Redundant servers help prevent service disruptions, while backups restore data after a disruption has occurred.
Pros and cons of server redundancy
- Improved fault tolerance and reduced downtime.
- Increased system performance through load distribution.
- Enhanced data protection and reliability.
- Increased costs for hardware, maintenance, and energy.
- Complex implementation and management.
- Potential for data inconsistency if not properly synchronized.
Server redundancy tips
- Implement a combination of load balancing, failover, and mirroring strategies for optimal redundancy.
- Regularly monitor and maintain redundant servers to ensure they are functioning correctly.