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86 lines
3.2 KiB
Markdown
86 lines
3.2 KiB
Markdown
# Elastic Block Store
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Persistent [block storage][what is block storage?] for [EC2 Instances][ec2].
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1. [TL;DR](#tldr)
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1. [Snapshots](#snapshots)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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<details>
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<summary>Real world use cases</summary>
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```sh
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# Clean up unused volumes.
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aws ec2 describe-volumes --output 'text' --filters 'Name=status,Values=available' \
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--query "Volumes[?CreateTime<'2018-03-31'].VolumeId" \
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| xargs -pn '1' aws ec2 delete-volume --volume-id
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```
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</details>
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Volumes can have their size **increased**, but **not** reduced.<br/>
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After increase, the filesystem **must** be [extended][Extend the file system after resizing an EBS volume] to take
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advantage of the change in size.<br/>
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Apparently, Linux machines are able to do that automatically with a reboot.
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## Snapshots
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When created, snapshots are **incremental**.<br/>
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Incremental snapshots are stored in EBS' standard tier.
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Snapshots can be [archived][archive amazon ebs snapshots] to save money should they **not** need frequent nor fast
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retrieval.<br/>
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When archived, incremental snapshots are converted to **full snapshots** and moved to EBS' archive tier.
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> The minimum archive period is 90 days.<br/>
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> If deleting or permanently restoring an archived snapshot before the minimum archive period, one is billed for all the
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> remaining days in the archive tier, rounded to the nearest hour.
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When access to archived snapshots is needed, they need to be restored to the standard tier before use. Restoring can
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take **up to 72h**.
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## Further readings
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- [Amazon Web Services]
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- [What is block storage?]
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- AWS' [CLI]
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- [Archive Amazon EBS snapshots]
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- [Automate snapshot lifecycles]
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- [Choose the best Amazon EBS volume type for your self-managed database deployment]
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- [Extend the file system after resizing an EBS volume]
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### Sources
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- [Documentation]
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- [Delete Unused AWS EBS Volumes]
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- [`describe-volumes`][describe-volumes]
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- [`delete-volume`][delete-volume]
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- [How do I increase or decrease the size of my EBS volume?]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- Knowledge base -->
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[amazon web services]: README.md
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[cli]: cli.md
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[ec2]: ec2.md
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<!-- Upstream -->
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[archive amazon ebs snapshots]: https://docs.aws.amazon.com/ebs/latest/userguide/snapshot-archive.html
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[automate snapshot lifecycles]: https://docs.aws.amazon.com/ebs/latest/userguide/snapshot-ami-policy.html
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[choose the best amazon ebs volume type for your self-managed database deployment]: https://aws.amazon.com/blogs/storage/how-to-choose-the-best-amazon-ebs-volume-type-for-your-self-managed-database-deployment/
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[delete-volume]: https://docs.aws.amazon.com/cli/latest/reference/ec2/delete-volume.html
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[describe-volumes]: https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-volumes.html
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[documentation]: https://docs.aws.amazon.com/ebs/
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[extend the file system after resizing an ebs volume]: https://docs.aws.amazon.com/ebs/latest/userguide/recognize-expanded-volume-linux.html
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[how do i increase or decrease the size of my ebs volume?]: https://repost.aws/knowledge-center/ebs-increase-decrease-volume-size
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[what is block storage?]: https://aws.amazon.com/what-is/block-storage/
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<!-- Others -->
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[delete unused aws ebs volumes]: https://www.nops.io/unused-aws-ebs-volumes/
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