Setting the file. One moment.
Subchapter 43.2
references/ebs-knowledge.mdMarkdown6 KBView on GitHub
This reference captures information addressing common gotchas and frequently asked questions for Amazon EBS to support accurate model responses. It is not a complete specification. The authoritative source for current specifications, limits, quotas, and API behavior is the Amazon EBS User Guide, , , and . Retrieve current specifications, limits, and quotas from those pages before citing specifics; cite figures only from those pages.
What it is: Amazon EBS is high-performance, durable block storage for Amazon EC2: network-attached volumes that persist independently of the instance and are replicated within an Availability Zone, with a range of SSD and HDD volume types to match performance and cost to the workload.
Well-suited for: workloads that need durable, low-latency block storage attached to a single EC2 instance, such as boot volumes, databases, transactional applications and file systems, dev/test environments, sequential batch processing, and log and data warehouse scans.
You MUST retrieve information from the linked documentation in the below table before answering any user question on the related topic.
| Topic | Example service characteristics, features, and actions | Documentation |
|---|---|---|
| Access and protocols | single-instance attachment; Availability Zone scope; Multi-Attach; cross-AZ and cross-Region portability | Amazon EBS volumes (opens in a new tab) |
| Deployment and availability | Availability Zone scope; in-AZ replication; snapshot portability | Amazon EBS overview (opens in a new tab) |
| Volume types | gp3; io2 Block Express; st1; sc1; boot volume requirements | Amazon EBS volume types (opens in a new tab) |
| Data protection and management | snapshots; Volume Clones; Elastic Volumes; Fast Snapshot Restore; Provisioned Rate for Volume Initialization; time-based snapshot copy; snapshot archive; Amazon Data Lifecycle Manager; Recycle Bin | Amazon EBS snapshots (opens in a new tab), Copy an Amazon EBS volume (opens in a new tab), EBS direct APIs (opens in a new tab) |
| Performance | instance EBS bandwidth ceiling; gp3 provisioned performance; lazy-load on first read | Amazon EBS volume performance (opens in a new tab) |
| Security | encryption by default; encrypted snapshot sharing; least-privilege IAM on destructive actions; tags and descriptions | Security in Amazon EBS (opens in a new tab) |
| Health and monitoring | CloudWatch metrics; alarms; CloudTrail | Monitoring Amazon EBS (opens in a new tab) |
| Pricing | provisioned capacity; provisioned performance; snapshot storage; snapshot archive; Fast Snapshot Restore; detached-volume charges; gp2-to-gp3 migration (not exhaustive, review pricing page for the full list of pricing dimensions) | Amazon EBS pricing (opens in a new tab) |
You MUST retrieve information from the linked documentation in the below table before answering any user question on the related service.
| Example service | Example characteristics and common workloads | Documentation |
|---|---|---|
| EC2 instance store | ephemeral local block storage; SSD and HDD variants; data loss on stop, terminate, hibernate, or hardware failure | Instance store temporary block storage for EC2 instances (opens in a new tab), Amazon EC2 FAQs (opens in a new tab) |
| Amazon EKS (EBS CSI driver) | Kubernetes persistent and ephemeral volumes on EBS | Use Kubernetes volume storage with Amazon EBS (opens in a new tab) |
You MUST retrieve information from the linked documentation in the below table before providing the user with any guidance on the related area.
| Example area | Example errors | Example fixes | Documentation |
|---|---|---|---|
| Capacity and scaling | resize not reflected in OS; modification limits | extend the OS file system after the volume optimizes | Extend the file system after resizing (opens in a new tab), Modify a volume (opens in a new tab) |
| Performance | high latency; slow first reads on restored volumes | check the instance bandwidth ceiling; pre-hydrate restored volumes | Amazon EBS-optimized instance types (opens in a new tab), Amazon EBS fast snapshot restore (opens in a new tab) |
| Data protection and recovery | root volume deleted on terminate; encrypted snapshot fails to attach | review DeleteOnTermination and KMS permissions | Preserve data when an instance is terminated (opens in a new tab), Amazon EBS encryption (opens in a new tab) |
| Access and permissions | volume will not attach across AZ | snapshot and restore to move across AZs | Attach a volume (opens in a new tab) |
| Cost and billing | unexpected charges; billed size vs restore size | delete or snapshot unused volumes | View Amazon EBS snapshot information (opens in a new tab), Amazon EBS pricing (opens in a new tab) |