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Horizontal vs Vertical Scaling

Vertical Scaling:

• Just buy better instance lol
• However, this require a reboot – disruption
• Larger instances often carry a $premium; not cost efficient
• There’s always an upper cap on performance
• no app modification required, relatively simpler than HS

Horizontal Scaling

• just buy more instance
• load balancer may be needed
• No disruption when scaling
• no real limit to scaling
• often less expensive – not having to involve large instance premium