#AWS

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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#AWS

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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