#AWS

What is EBS?
Amazon Elastic Block Store (EBS) provides persistent block storage volumes for use with Amazon EC2 instances in the AWS Cloud. Each Amazon EBS volume is automatically replicated within it Availability Zone to protect you from component failure, offering high availability and durability.

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Types of EBS Storage:
1. General Purpose (SSD)
2. Provisioned IOPS (SSD)
3. Throughput Optimized Hard Disk Drive
4. Cold Hard Disk Drive
5. Magnetic


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EBS:-


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EBS vs Instance Store Volumes

All AMIs are categorized as either backed by Amazon EBS or backed by instance store

For EBS Volumes:
The root device for an instance launched from the AMI is an Amazon EBS volume created from an Amazon EBS Snapshot.

For Instance Store Volumes:
The root device for an instance launched from the AMI is an instance store volume created from a template stored in Amazon S3.


* Instance Store volumes are sometimes called Ephemeral Storage.
* Instance store volumes cannot be stopped. If the underlying host fails, you will lose your data.
* EBS backed instances can be stopped. You will not lose the data on this instance if it is stopped.
* You can reboot both, you will not lose your data.
* By default, both ROOT volumes will be deleted on termination. However, with EBS volumes, you can tell AWS to keep the root device volume

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ENI vs ENA vs EFA

ENI - Elastic Network Interface
essentially a virtual network card.

EN - Enhanced Networking
Uses single root I/O virtualization (SR-IOV) to provide high performance networking capabilities on supported instance types.

EFA - Elastic Fabric Adapter
A network device that you can attach to your Amazon EC2 instance to accelerate High Performance Computing(HPC) and machine learning applications.


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