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1.1. Benefits of Cloud Computing.md

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Benefits of Cloud Computing

  • Not an all-or-nothing service
    • You can gradually move to cloud, called also lift and shift
  • You're able to spend more time on what matters and less time managing the underlying details.

Cost effective

  • Provides pay-as-you-go or consumption-based pricig model.
    • No upfront infrastructure costs
    • No need to purchase and manage costly infrastructure that you may not use to its fullest
    • The ability to pay for additional resources only when they are needed
    • The ability to stop paying for resources that are no longer needed
  • Enables better cost predictions using pricing of individual resources/services.
    • You can analyze future growth using historical data.

Scalable

  • Increase or decrease the resources and services used based on the demand or workload at any given time
  • Cloud computing supports both:
    • Horizontal scaling
      • Scaling "out"
      • Adding more servers that function together as one unit
    • Vertical scaling
      • Scaling "up"
      • Adding resources to increase the power of an existing server
        • e.g.Add more CPUs, or add more memory
  • Scaling can be done manually or automatically based on e.g.
    • specific triggers such as CPU utilization

Elastic

  • Cloud computing system can automatically add & remove resources to meet the current demand.
  • E.g.
    • Add resources for the peak operating hours during which most people access the application
      • Only pay for increased resources during those hours
    • Remove the resources when the traffic normalizes
      • Do not pay anymore

Current

  • Eliminates the burdens of maintaining software patches, hardware setup, upgrades, and other IT management tasks
    • automatically done
  • The computer hardware is maintained and upgraded by the cloud provider
    • e.g. if a disk fails it'll be replaced by the cloud provider

Reliable

  • Cloud provider offers data backup, disaster recovery, and data replication services
  • Redundancy is often built into cloud services architecture
    • so if one component fails, a backup component takes its place
    • this is referred to as fault tolerance and it ensures that your customers aren't impacted when a disaster occurs.

Global

  • Fully redundant datacenters located in various regions all over the globe.
  • Enables local presence close to your customers to give them the best response time
  • Replicate your services into multiple regions for redundancy and locality
  • Select a specific region to ensure you meet data-residency and compliance laws for your customers.

Secure

  • You have:
    • Physical security
      • Who can access the building, who can operate the server racks, and so on
      • Walls, cameras, gates, security personnel, employees have access only to those resources that they've been authorized to manage.
    • Digital security
      • Who can connect to your systems and data over the network.
      • E.g. only authorized users to be able to log into virtual machines or storage systems running in the cloud
      • Have tools to mitigate security threats that you can use.
  • Broad set of policies, technologies, controls, and expert technical skills
    • can provide better security than most organizations can otherwise achieve