Amazon Web Services provides two main storage solutions - S3 and Ephemeral Storage that I have outlined below:
Ephemeral Storage: This is a non-persisent block level storage solution that Amazon offers free of charge. When allocated if a VM instance is turned off (not restarted) all data on the storage is lost.
Ephemeral Storage is bundled with EC2 instances and can be used in some of the following scenerios:
- Used as a buffer, caches for applications
- Replication data for load-balanced virtual machines
The storage does not have any access speed or availaiblity garuntees and should therefore not be used for anyting mission critical - as man different AWS users typically share a server within the Ephemeral Storage platform.
Amazon Simply Storage (S3): This is a persistent storage solution which is accessable via a web API over HTTP and HTTPS.
Data is held within "buckets" similar to Azure's "containers" and can be of unlimited size - although object sizes are limited to 5TB.
You are priced on the amount of storage used and the outgoing bandwdith - although not the incoming bandwidth.
There are two types of storage types:
- Standard storage: That provides very high data redundancy via replicating your data between availability zones - providing quote "99.999999999%" durability.
- Reduced Redundancy Storage: Provides reduced redundancy / durability for storage at 99.99% - although is cheaper than standard storage.
Elastic Block Storage (EBS): Is part of EC2 and is not accessable via any web API's - it is used as a persistent storage type for EC2 instances.
For example the system drive within a newly provisioned virtual machine will utilize EBS - although additional EBS volumes can be added, removed and moved between different virtual machines and availability zones.
You are able to take snapshots of EBS - that are stored within S3 storage, although not directly accessable to us.
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