Instance Purchasing Options

On-Demand Instances

• Whenever you need an instance you can create, manage and terminate the instance
• Most widely option and costlier option
• This is a default option
• Billing will stop for ec2 instance when the state is stopped
• You will charged for whatever you have used

Reserved Instances

• Reserved instance can save costs bcoz you give commitment of 1 or 3 years to amazon

• Term: One-Year/3-Year

• Payment:

  • All Upfront
  • Partial Upfront and rest is monthly
  • No-Upfront

• Offerings:

  • Standard: Here you get most discount it can only be modified
  • Convertable: lesser discount, because it can be exchanged and modified

• Price comparisions

  • On-demand m4.large
  • All upfront saves lot of cost for m4.large

• In Reserved instances, you will be paying if the machine is running or stopped.

Dedicated Hosts

• Dedicated host is a physical server on which you can create Ec2 instances and in AWS you can reserver Dedicated Hosts
• Dedicated Hosts Restrictions
  • AMIS => RedHat, SUSE and SQL Server AMIs
  • Instance family => R5,C5 and M5
• Dedicated Hosts are costly

Spot Instances

• Designed by AWS to make use of unused hardware in AZ’s
• AWS allows users to bid for Spot Instances
  • Spot price
• Caution: Never use spot instances for primary workloads.

AWS Nitro System

• Xen Hypervisor will be as shown below

• For this Xen hypervisor to work effeciently they ise two software components on the Hypervisor

  • Virtual Machine Manager (VMM):
    • Trap the rejections caused due to permission issues and handle them
  • Device Model (DM):
    • software which can handle instructions such as communication to network on a different server

• AWS had build ASIC (Chips) for effeciently handling software tasks which has increased the EC2 Perfomance

• This project is called as AWS Nitro

  • Nitro Cards
  • Nitro Security Chip
  • Nitro Hypervisor

• Refer Here for basic info

• Look into resources section on this page Refer Here