Lecture 2: Cloud Infrastructure

서버, 스토리지 등 cloud computing 모두 가능

Problem of On-Premise

• over provision - waste of resources
  under provision - can't service gameplay, dissatisfied customers leave
• difficult to dimension (load can vary)
• maintatin : expensive
• needs to invest a lot of money in hw
• needs expertise
• needs maintenance
• Scaling up is difficult.
  - Need to order new servers, install them, and integrate with existing clusters. It can take weeks.
  - Large scaling factors may require major redesign. e.g., new storage system, new interconnect, new building.
• Scaling down is difficult.
  - What to do with unnecessary hardware?
  - Server consumes about 60% of its peak power even when it is in idle state.
  - Many fixed costs such as construction

Benefits of Cloud

• reduced investments and proportional costs
• pay as you go pricing
  - no minimum or up-front fee
  - helpful when apps have variable utilization
• cloud comes with increased scalability
  - Clouds can instantly and dynamically allocate IT resources to cloud consumers ondemand.
• Economies of scale
  - CSP
• Increased availability and reliability
  - 99.9% per Month
• casestudy that shows more people signed up by using Cloud service - Animoto

Risks and Challenges of Clou

• Limited portability between cloud providersd
• Multi-regional compliance and legal issues
  - Different regions have different data and privacy regulations.

특히 Physical cables가 networking