What are the main tasks and benefits of using replication in data storage systems?

Replication in data storage systems is the process of copying and maintaining identical data on multiple servers or nodes. The main tasks and benefits of replication:

• Increased fault tolerance: when one node fails, data remains accessible on others, reducing the risk of data loss.
• Improved read performance: read requests can be distributed among replicas, reducing the load on the primary server.
• Load balancing: replicas help distribute traffic, especially in systems with a high number of requests.
• Geographical distribution: replicas can be located in different regions, reducing latency for users.

Example: in PostgreSQL database, replication can be configured so that the primary server accepts writes, while replicas handle read requests, increasing system scalability.