AWS Elastic Block Store

EBS 101

Elastic Block Store
Each Amazon EBS volume is automatically replicated within its AZ to protect you from component failure
5 types
- gp2 - General purpose SSD - most workloads
- io1 - Provisioned IOPS (SSD) - dbs / highest performance / mission critical apps / 64k IOPS
- st1 -Throughput optimized HDD - magnetic - big data and data warehouses
- sc1 - Cold HDD - file servers / lowest cost HDD vol
- Standard - Magnetic - previous gen HDD / infrequently accessed data

EBS Volumes & Snapshots

Snapshots take a while
Can create image from EBS snapshot
- Different virtualization types available
  - Paravirtual (PV)
  - Hardware vritual machine (HVM) - default - gives more EC2 instance options
Volumes exist on EBS
Snapshots exist on S3
Snapshots are point in time copies of volumes
Snapshots are incremental - only changes are replicated to S3
To take a snapshot of a root device - best practice to stop the ec2 instance to stop first
Can create AMI from Snapshot
Can change EBS volume sizes on the fly
Volumes will always be in the same AZ as the EC2 instance

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