By default, you cannot delete an EBS Volume that is currently attached to a running instance. Be sure to detach an EBS volume from the running instance before trying to delete an EBS Volume.
Before deleting an EBS Volume you may want to create an EBS Snapshot as a final backup.
WARNING!
When an EBS volume is deleted, any references to that volume will also be deleted, including any servers that have been configured to attach that particular volume at launch time. As a precautionary step you should also check to see which servers are referencing the volume.
Go to Manage -> Storage -> EBS Volumes and select the volume that you want to delete. Under the Servers tab you'll see if the volume is currently attached to a running server or if any other servers are configured to attach the volume at boot time.

To delete an EBS volume, go to Manage -> Storage -> EBS Volumes and click on a volume's delete icon.
