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Amazon Elastic Block Store

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Amazon Elastic Block Store
Amazon Elastic Block Store

Amazon Elastic Block Store (EBS) provides raw block-level storage that can be attached to Amazon EC2 instances and is used by Amazon Relational Database Service (RDS).[1]

Amazon EBS provides a range of options for storage performance and cost. These options are divided into two major categories: SSD-backed storage for transactional workloads, such as databases and boot volumes (performance depends primarily on IOPS), and disk-backed storage for throughput intensive workloads, such as MapReduce and log processing (performance depends primarily on MB/s).

Use case

In a typical use case, using EBS would include formatting the device with a filesystem and mounting it. EBS supports advanced storage features, including snapshotting and cloning. As of September 2020, EBS volumes can be up to 2TB in size using the MBR partitioning scheme, and up to 16TB using the GPT partitioning scheme.[2]

EBS volumes are built on replicated back end storage, so that the failure of a single component will not cause data loss.

History

EBS was introduced by Amazon in August 2008.[3] As of March 2018 30 GB of free space was included in the free tier of Amazon Web Services 2017.[4]

Volume types

The following table shows use cases and performance characteristics of current generation EBS volumes:[5]

Solid State Drives (SSD) Hard Disk Drives (HDD)
Volume Type EBS Provisioned IOPS SSD (io1) (since 2012) [6] EBS General Purpose SSD (gp2)* Throughput Optimized HDD (st1) Cold HDD (sc1)
Short Description Highest performance SSD volume designed for latency-sensitive transactional workloads General Purpose SSD volume that balances price performance for a wide variety of transactional workloads Low cost HDD volume designed for frequently accessed, throughput intensive workloads Lowest cost HDD volume designed for less frequently accessed workloads
Use Cases I/O-intensive NoSQL and relational databases Boot volumes, low-latency interactive apps, dev & test Big data, data warehouses, log processing Colder data requiring fewer scans per day
API Name io1 gp2 st1 sc1
Volume Size 4 GB - 16 TB 1 GB - 16 TB 500 GB - 16 TB 500 GB - 16 TB
Max IOPS**/Volume 32,000 10,000 500 250
Max Throughput/Volume 500 MB/s 160 MB/s 500 MB/s 250 MB/s
Max IOPS/Instance 80,000 80,000 80,000 80,000
Max Throughput/Instance 1,750 MB/s 1,750 MB/s 1,750 MB/s 1,750 MB/s
Price $0.125/GB-month

$0.065/provisioned IOPS

$0.10/GB-month $0.045/GB-month $0.025/GB-month
Dominant Performance Attribute IOPS IOPS MB/s MB/s

*Default volume type

**io1/gp2 based on 16K I/O size, st1/sc1 based on 1 MB I/O size

Features

Amazon EBS provides several features that assist with data management, backups, and performance tuning:

  • The Amazon Data Lifecycle Manager is an automated mechanism that can back up data from EBS volumes, creating and deleting EBS snapshots on a predefined schedule.[7]
  • Elastic Volumes makes it possible to adapt volume size to an application's current needs, using Amazon CloudWatch and AWS Lambda to automate volume changes.
  • Amazon EBS Encryption encrypts data at rest for EBS volumes and snapshots, without having to manage a separate secure key infrastructure.
  • EBS volume tagging makes it possible to find and filter EBS resources on the Amazon Console and CLI.[8]
  • Software-level RAID arrays make it possible to create groups of EBS volumes with high performance network throughput between them, using the standard RAID protocol.[9]

See also

References

  1. ^ "DB Instance Storage - Amazon Relational Database Service". docs.aws.amazon.com.
  2. ^ "Constraints on the size and configuration of an EBS volume". Amazon Web Services Documentation. Retrieved Sep 11, 2020.{{cite web}}: CS1 maint: url-status (link)
  3. ^ "Amazon EBS (Elastic Block Store) - Bring Us Your Data". Amazon Web Services Blog. August 20, 2008. Archived from the original on March 28, 2011. Retrieved May 31, 2013.
  4. ^ "AWS Free Tier". Amazon Web Services, Inc.
  5. ^ "Amazon Elastic Block Store (Amazon EBS) – Details – Amazon Web Services (AWS)". Amazon Web Services, Inc. Retrieved 2017-12-31.
  6. ^ "Announcing Provisioned IOPS for Amazon EBS". Amazon Web Services, Inc.
  7. ^ "Amazon EBS Features". Amazon Web Services. Retrieved Sep 11, 2020.{{cite web}}: CS1 maint: url-status (link)
  8. ^ "7 Little-Known Amazon EBS Features You Should Be Using". Sand Hill. January 17, 2020. Retrieved Sep 11, 2020.{{cite web}}: CS1 maint: url-status (link)
  9. ^ "AWS EBS: A Complete Guide and Five Functions You Should Start Using". Cloud Central Blog. June 4, 2019. Retrieved Sep 11, 2020.{{cite web}}: CS1 maint: url-status (link)
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