Note
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EBS
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One instance & locked in one AZ
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Snapshot to migrate across AZ
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Backups use IO
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EFS
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Multi-connection across AZ
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Only for Linux Instances (POSIX)
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Higher price point than EBS
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EC2 Instance Store
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Physically attached
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Ephemeral Storage
EBS
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EBS volumes…
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One instance (except multi-attach io1 / io2)
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Are locked at the Availability Zone (AZ) level
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gp2: IO increases if the disk size increases
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io1: can increase IO independently
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To migrate an EBS volume across AZ
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Take a snapshot
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Restore the snapshot to another AZ
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EBS backups use IO and you shouldn’t run them while your application is handling a lot of traffic
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Root EBS volumes of instances get terminated by default if the EC2 instance gets terminated. (Can disable this feature)
EFS
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Mounting 100s of instances across AZ
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EFS share website files (WordPress)
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Only for Linux Instances (POSIX)
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EFS has a higher price point than EBS
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Can leverage EFS-IA for cost savings
EC2 Instance Store
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Physically attached to the instances
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Will lose storage if instance is lost
