There is no way of attaching EBS volumes to multiple instances, see the EBS API overview: http://docs.amazonwebservices.com/AWSEC2/2010-08-31/DeveloperGuide/ebs

There is no way of attaching EBS volumes to multiple instances, see the EBS API overview: http://docs.amazonwebservices.com/AWSEC2/2010-08-31/DeveloperGuide/ebs-api-overview.html http://docs.amazonwebservices.com/AWSEC2/2010-08-31/Develope... What might work if you wanted to do this is to mount the EBS volume to an instance and then expose the volume using a network block device to multiple instances. Seems convoluted. Being able to attach EBS to multiple instances may be something Amazon will add if there is enough interest.