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Update EBS facts (#727)

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* Update EBS facts

Not sure how this got dropped, but it's nice that it's improved by now!

* BYOIP is a thing now
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Corey Quinn 2019-10-20 08:57:29 -04:00 • committed by Maish
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README.md
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@ -1017,8 +1017,8 @@ EBS
- ⏱**RAID:** Use [RAID drives](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/raid-config.html) for [increased performance](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSPerformance.html). - ⏱**RAID:** Use [RAID drives](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/raid-config.html) for [increased performance](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSPerformance.html).
- ⏱A worthy read is AWS’ [post on EBS IO characteristics](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html) as well as their [performance tips](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSPerformance.html#d0e86148). - ⏱A worthy read is AWS’ [post on EBS IO characteristics](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html) as well as their [performance tips](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSPerformance.html#d0e86148).
- ⏱One can [provision IOPS](http://aws.amazon.com/ebs/details/) (that is, pay for a specific level of I/O operations per second) to ensure a particular level of performance for a disk. - ⏱One can [provision IOPS](http://aws.amazon.com/ebs/details/) (that is, pay for a specific level of I/O operations per second) to ensure a particular level of performance for a disk.
- ⏱A single EBS volume allows 10k IOPS max. To get the maximum performance out of an EBS volume, it has to be of a maximum size and attached to an EBS-optimized EC2 instance. - ⏱A single gp2 EBS volume allows 16k IOPS max To get the maximum performance out of a gp2 EBS volume, it has to be of a maximum size and attached to an EBS-optimized EC2 instance.
- 💸Standard EBS volumes improve IOPS with size. It may make sense for you to simply enlarge a volume instead of paying for better performance explicitly. This can in many cases reduce costs by 2/3. - 💸Standard and gp2 EBS volumes improve IOPS with size. It may make sense for you to simply enlarge a volume instead of paying for better performance explicitly. This can in many cases reduce costs by 2/3.
- A standard block size for an EBS volume is 16kb. - A standard block size for an EBS volume is 16kb.
### EBS Gotchas and Limitations ### EBS Gotchas and Limitations
@ -1205,7 +1205,7 @@ Elastic IPs
### Elastic IP Gotchas and Limitations ### Elastic IP Gotchas and Limitations
- 🔸There is [officially no way](https://forums.aws.amazon.com/thread.jspa?threadID=171550) to allocate a contiguous block of IP addresses, something you may desire when giving IPs to external users. Though when allocating at once, you may get lucky and have some be part of the same CIDR block. - 🔸There is [officially no way](https://forums.aws.amazon.com/thread.jspa?threadID=171550) to allocate a contiguous block of IP addresses, something you may desire when giving IPs to external users. Though when allocating at once, you may get lucky and have some be part of the same CIDR block. If this is important to you, you may want to [bring your own IP](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-byoip.html), which is more involved than this guide will go into.
Glacier Glacier
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