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added a couple of points about EFS

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Additionally, fixed the incorrect link to "short list" of APIs and
SDKs.
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Mohit Agarwal 2016-10-18 00:09:11 +05:30
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README.md
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@ -453,7 +453,7 @@ So if you’re not going to manage your AWS configurations manually, what should
### APIs and SDKs
- **SDKs** for using AWS APIs are available in most major languages, with [Go](https://github.com/aws/aws-sdk-go), [iOS](https://github.com/aws/aws-sdk-ios), [Java](https://github.com/aws/aws-sdk-java), [JavaScript](https://github.com/aws/aws-sdk-js), [Python](https://github.com/boto/boto3), [Ruby](https://github.com/aws/aws-sdk-ruby), and [PHP](https://github.com/aws/aws-sdk-php) being most heavily used. AWS maintains [a short list](http://docs.aws.amazon.com/AmazonCloudFront/latest/APIReference/AWSLibraries.html), but the [awesome-aws list](https://github.com/donnemartin/awesome-aws#sdks-and-samples) is the most comprehensive and current. Note [support for C++](https://github.com/donnemartin/awesome-aws#c-sdk) is [still new](https://aws.amazon.com/blogs/aws/introducing-the-aws-sdk-for-c/).
- **SDKs** for using AWS APIs are available in most major languages, with [Go](https://github.com/aws/aws-sdk-go), [iOS](https://github.com/aws/aws-sdk-ios), [Java](https://github.com/aws/aws-sdk-java), [JavaScript](https://github.com/aws/aws-sdk-js), [Python](https://github.com/boto/boto3), [Ruby](https://github.com/aws/aws-sdk-ruby), and [PHP](https://github.com/aws/aws-sdk-php) being most heavily used. AWS maintains [a short list](https://aws.amazon.com/tools/#sdk), but the [awesome-aws list](https://github.com/donnemartin/awesome-aws#sdks-and-samples) is the most comprehensive and current. Note [support for C++](https://github.com/donnemartin/awesome-aws#c-sdk) is [still new](https://aws.amazon.com/blogs/aws/introducing-the-aws-sdk-for-c/).
- **Retry logic:** An important aspect to consider whenever using SDKs is error handling; under heavy use, a wide variety of failures, from programming errors to throttling to AWS-related outages or failures, can be expected to occur. SDKs typically implement [**exponential backoff**](https://docs.aws.amazon.com/general/latest/gr/api-retries.html) to address this, but this may need to be understood and adjusted over time for some applications. For example, it is often helpful to alert on some error codes and not on others.
- ❗Don’t use APIs directly. Although AWS documentation includes lots of API details, it’s better to use the SDKs for your preferred language to access APIs. SDKs are more mature, robust, and well-maintained than something you’d write yourself.
@ -835,9 +835,11 @@ EFS
### EFS Basics
- 🐥**EFS** is Amazon’s new (general release 2016) network filesystem.
- It is designed to be highly available and durable and each EFS file system object is redundantly stored across multiple availability zones.
- It is similar to [EBS](#ebs) in that it is a network-attached drive, but it [differs in important ways](https://aws.amazon.com/efs/details/#When_to_Use_Amazon_EFS_vs._Amazon_EBS):
- EFS can be attached to many instances (up to thousands), while EBS can only be attached to one drive. It does this via [NFSv4](https://en.wikipedia.org/wiki/Network_File_System).
- EFS can offer higher throughput (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 file systems can automatically scale to petabytes of data without needing to provision storage.
- EFS can be attached to many instances (up to thousands), while EBS can only be attached to one drive. It does this via [NFSv4.1](https://en.wikipedia.org/wiki/Network_File_System).
- 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 cannot be used as a boot volume or in certain other ways EBS can.
- EFS costs much more than EBS (up to [three times as much](#storage-durability-availability-and-price)).