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Merge pull request #483 from bgdnlp/EFS-encryption

Note that EFS encryption is now available and small adjustments.
pull/488/head
Corey Quinn 2 years ago
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@@ -956,10 +956,9 @@ EFS
### EFS Basics

- 📒 [Homepage](https://aws.amazon.com/efs/) ∙ [User guide](http://docs.aws.amazon.com/efs/latest/ug) ∙ [FAQ](https://aws.amazon.com/efs/faq/) ∙ [Pricing](https://aws.amazon.com/efs/pricing/)
- 🐥**EFS** is Amazon’s new (general release 2016) network filesystem.
- 🐥**EFS** is Amazon’s network filesystem. It’s presented as an [NFSv4.1](https://en.wikipedia.org/wiki/Network_File_System#NFSv4) server. Any compatible NFSv4 client can mount it.
- It is designed to be highly available and durable and each EFS file system object is redundantly stored across multiple availability zones.
- EFS is designed to be used as a shared network drive and it can automatically scale up to petabytes of stored data and thousands of instances attached to it.
- It’s presented as an [NFSv4.1](https://en.wikipedia.org/wiki/Network_File_System#NFSv4) server, so any compatible NFS client can mount it.
- EFS can offer [higher throughput](http://docs.aws.amazon.com/efs/latest/ug/performance.html) (multiple gigabytes per second) and better durability and availability than EBS (see [the comparison table](#storage-durability-availability-and-price)), but with higher latency.
- EFS is priced based on the volume of data stored, and costs [much more than EBS](#storage-durability-availability-and-price); it's in the ballpark of three times as much compared to general purpose gp2 EBS volumes.
- ⏱ [Performance](http://docs.aws.amazon.com/efs/latest/ug/performance.html) is dependent on the volume of data stored, as is the price:
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### EFS Gotchas and Limitations

- 🔸 A number of NFSv4.1 features are [not supported](http://docs.aws.amazon.com/efs/latest/ug/nfs4-unsupported-features.html) and there are some [limits](http://docs.aws.amazon.com/efs/latest/ug/limits.html) to the service.
- 🔸 As of 2017-02, EFS does not offer disk level encryption, though it is on the roadmap.
- 🔸 As of 2017-08, EFS offers disk level encryption for new drives. For file systems created before that date, encryption can only be achieved by moving the data to a new EFS volume.
- 🔸 An EFS file system [can be mounted on premises](https://aws.amazon.com/efs/faq/#on-premises) over Direct Connect.
- 🔸 An EFS file system can NOT be mounted over VPC peering or VPN, even if the VPN is running on top of Direct Connect.
- 🔸 Using an EFS volume on Windows is not supported.

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