How can an EBS volume that is currently attached to an EC2 instance be migrated from one Availability Zone to another?
Detach the volume and attach it to another EC2 instance in the other AZ.
Simply create a new volume in the other AZ and specify the original volume as the source.
Create a snapshot of the volume, and create a new volume from the snapshot in the other AZ.
Detach the volume, then use the ec2-migrate-volume command to move it to another AZ.
Explanations:
You cannot directly attach a volume to an instance in a different Availability Zone. You would need to first create a snapshot or new volume in the target AZ.
Creating a new volume directly from the original volume without using a snapshot is not possible. Volumes must be in the same AZ as the instance they are attached to.
Creating a snapshot of the volume and then creating a new volume from that snapshot in the desired AZ is the correct method for migrating an EBS volume across AZs.
The ec2-migrate-volume command does not exist; instead, the proper method involves using snapshots to create a new volume in the target AZ.
I figure that the answer is:
Create a snapshot of the volume, and create a new volume from the snapshot in the other AZ.