Disk Storage in AWS

• Disk Storage for EC2 instances is provided by AWS using
  • Elastic Block Storage
  • Instance Store
• Disks are categorized as
  • Root Disk: Disk with Operating System
  • Disk
• Free Tier Plan
  • 30 GB of General Purpose Disk is free per month
• Root Disk is always EBS
• EC2 instance Type will provide whether instance store can be attached or not.
• Two kinds of Disks Depending on Data Persistence are
  • Ephemeral Disks: Instance Store
  • Non Ephemeral: EBS

Creating a EC2 instance with Hard disk (Volume)

• Launch an Ec2 Instance by selecting AMI and click next till you see storage section

• Number of Disks can be added
• Size of Disk can be changed
• An option to choose not to delete the Volume after EC2 machine is terminated.

Adding Volumes to Existing EC2 machines

• Create a Volume in the same AZ as your EC2 instance.
• Attach the volume to EC2 machine

Increase the Size of Volume while EC2 Instance is Running

• EBS Volumes are Elastic Volumes because they support change in disk size while the machine is running.

1 GiB = 1024

Volume Types in EBS

• General Purpose SSD
• Provisioned IOPS
• Cold HDD
• Throughput Optimized HDD
• Magnetic