Scaling

Vertical Scaling

• resizing an instance
• each resize requires a reboot - disruption
• larger instances often carry a premium
• upper cap on performance - instance size
• no application modification
• works for all applications even monoliths

Horizonal Scaling

• add more instances
• Sessions are everything
  • requires external application support (load balancer is needed)/ off-host sessions (info out of servers)
• no disruption when scaling
• no real limit
• less expensive