Scaling

Vertical Scaling

- When the traffic is low

• Has a hard limit, since impossible to add unlimited CPT and memories to a single server
• Does not have failover and redundancy

Horizontal Scaling

Disadvantages

• Introduce the complexity of cloning the server
  • Servers should be stateless (no user-related data like sessions)
  • Session can be stored in a centralised data store such as a database or persistent cache
• Downstream infrastructures like caches and databases need to handle more simultaneous connections