CODEWITHSUNDEEP
amazon-web-servicesamazon-ec2aws-ebs
Ebin Davis
Ebin Davis

Reputation: 6119

Root Device and Block Devices difference

Can someone help me to understand the difference between Root device and Block devices for EC2 instance. You can see a snapshot i posted below.

enter image description here

What i tried to achieve is :

  1. I created a snapshot of the attached volume of the EC2.

  2. Detached the volume from instance.

  3. Deleted the volume.
  4. Created a new volume from the snapshot.
  5. Reattached the newly created volume to the instance.

But it only attaches to the Block Devices but not to the root devices. And results in the failure to launch the instance. enter image description here

My apologies if my question is wrong. Awaiting your reply.

Thanks in advance.

Upvotes: 7

Views: 3712

Answers (1)

VinothNair
VinothNair

Reputation: 634

The Root device is the EBS volume for the AMI in which your instance is based on. This will contain the operating system. If not configured then, AWS will use the default values of the AMI.

You can configure additional Block device entries optionally to mount additional volumes on the instance, besides the root volume. It can be empty or from a snapshot.

Upvotes: 4

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