AWS Purchasing Options for EC2

• AWS has following Purchasing Options for EC2. Refer Here for official numbers
  • On demand:
    • We have no commitments with AWS
    • This is the higest priced option and it will be charged
      • per hour
      • per second
    • EC2 pricing will be done only when instance is in running state
  • Spot Instances:
    • We can save costs on under utilized ec2 instance hardwares in aws regions
    • On-demand price
      
    • Spot price
      
    • If the demand increases, spot instance will be evicted.
  • Reserved Instances:
    • Here we give 1 year or 3 years commitment to AWS
    • Reserved has two options
      • Standard Reserved Instances
      • Convertible Reserved Instances
    • Payment Options
      • No Upfront
      • Partial Upfront
      • All upfront
  • Dedicated Host: We reserve the physical servers and here also we have on-demand and reserved options. Refer Here
  • Capacity Reservations: Refer Here

Lets create Pricing Estimates

• I have an application which is running in production which requires 10 C series with 16 cores. out of which 7 are required to run the application. This application is in production for last year and has a road map for next 5 years.
  • Solution:
    • 3 years no upfront for 7 servers
    • three servers spot instances
      
• I have and application which requires
  • 7 servers in 3 regions
  • each server should be memory optimized and requires atleast 32 gb of RAM
  • each server also requires 100 GB disk
  • Operating system in Linux
  • During peak times each regions max capacity will be 15 servers
• I have an application which requires
  • 2 servers
  • server should be storage optimized
  • requires 16 GB of RAM
  • Usage is not constant, random spike/peak usage
  • This application is not guaranteed to run for more than a year