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How can an EBS volume that is currently attached to an EC2 instance be migrated from one Availability Zone
to another?

A.
Simply create a new volume in the other AZ and specify the original volume as the source.

B.
Detach the volume, then use the ec2-migrate-volume command to move it to another AZ.

C.
Create a snapshot of the volume, and create a new volume from the snapshot in the other AZ.

D.
Detach the volume and attach it to another EC2 instance in the other AZ.

Explanation:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumes.html

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