EC2 Instance Storage

 EC2 Instance Storage

EBS

  • An EBS (Elastic Block Store) Volume is a network drive you can attach to your instances while they run
  • It allows your instances to persist data, even after their termination
  • They can only be mounted to one instance at a time (at the CCP level)
  • They are bound to a specific availability zone
  • Analogy: Think of them as a "network USB stick"
Notes: CCP - Certified Cloud Practitioner - one EBS can be only mounted to one EC2 instance
Associate Level (Solution Architect, Developer, SysOps): "multi-attach" feature for some EBS

EBS Volume

  • It's a network drive (i.e. not a physical drive)
    • It uses the network to communicate the instance, which means there might be a bit of latency
    • It can be detached from on EC2 instance and attached to another one quickly
  • It's locked to an Availability Zone (AZ)
    • An EBS Volume is us-east-1a cannot be attached to us-east1b
    • To move a volume across, you first need to snapshot it
  • Have a provisioned capacity (size in GBs, and IOPs)
  • You get billed for all the provisioned capacity
  • You can increase the capacity of the drive over time
  • It has a option know as delete on termination
  • Controls the EBS behavior when as EC2 instance terminates
    • By default, the root EBS volume is deleted (attribute enabled)
    • By default, any other attached EBS volume is not deleted (attribute disabled)
  • This can be controlled by the AWS console/AWS CLI
  • Use case: preserve root volume when instance is terminated
  • EBS volume named io1 and io2 can be attached to multiple instances and known as EBS Multi-Attach feature.


EBS Snapshots

  • Make a backup (snapshot) of your EBS volume at a point in time
  • Not necessary to detach volume to do snapshot, but recommended
  • Can copy snapshots across AZ or Region

EBS Snapshot features:

  • EBS Snapshot Archive
    • Move a Snapshot to an "archive tier" that is 75% cheaper
    • Takes within 24 to 72 hours for restoring the archive
  • Recycle Bin for EBS Snapshots
    • Setup rules to retain deleted snapshots so you can recover them after an accidental deletion
    • Specify retention (from 1 day to 1 year)


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