MultiCloud Classroom notes 29/Jan/2025

AWS EC2 Instance Purchasing Options

• We have already understood on-demand instances.
• Refer Here for other options.
• Other Options
  • Savings Plan
  • Reserved Instances: Reserved INstances will have the following payment modes
    • complete upfront
    • partial upfron
    • No upfront
  • Spot Instances: This is from the free hardware in AWS. Machine will be evicted from you if there is actual demand. Useful for secondary processing.

Azure VM Purchase Options

• Pay as you Go (On-demand)
• Azure Savings plan for compute
• Reserved Instances
• Spot Instances
• Refer Here for pricing

Impact of Disks on Virtual machines

• We have two types of disks
  • ephemeral/temp
    • AWS => instance store
    • Azure => local/temp disk
  • persistent:
    • AWS => EBS Volume
    • Azure => Data Disks/OS Disk
• OS has to be on a persistent disk
• Azure supports temp/local disks for instance sizes and defines the size of temp disk. AWS doesnot support instance storage for all instance types, only few instance types have instance stores
• Azure defines the following based on instance size. OS disk will be the one disk extra
  • number of data disks
  • local disk size
    
• In AWS instance storage is part of instance type spec
  
  
• The disk with OS is called as root volume and rest of persistent disks are called as volumes
  
• Findout what is maximum number of volumes that can be added to an ec2 instance.