7. Option 2 - Expand infrastructure
• £1m upfront cost
• £3.5m over 3 years
8. Option 3 - Move to the cloud
• £100k upfront expense to reserve instances
• £1.8m over 3 years
9. Why cheaper?
• Pay as you go pricing
o Ability to scale upwards in real time to meet peak demand
o Ability to scale downwards in real-time in quiet periods to save on costs
10. Which cloud?
• Rackspace slightly cheaper
• Rackspace has better SLAs
• AWS APIs, SDKs and documentation
• AWS products and features
• AWS has an EU data center
11. Other considerations
• Integrating cloud servers into internal EE
systems
• Limited control over hardware and low-level
configuration
• Very limited SLAs from AWS
• Security concerns, Privacy concerns
• Resource contention / noisy neighbours
12. Technical design
• Anti-Fragile (rather than robust)
• Multiple data centers
• Multiple environments
• Driven by configuration (no manual changes)
• Automation
• Central Control