https://aws.amazon.com/cn/premiumsupport/knowledge-center/snapshot-ebs-raid-array/ To create an "application-consistent" snapshot of your RAID array, stop applications from writing to the RAID array, and flush all caches to disk. Then ensure that theassociated EC2 instance is no longer writing to the RAID array by taking steps such as freezing the file system, unmounting the RAID array, or *shutting down the associated EC2 instance*. After completing the steps to halt all I/O, take a snapshot ofeach EBS volume. http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs- detaching-volume.html You candetach an Amazon EBS volume from an instance explicitly or by terminating the instance. However, if the instance is running, you must first unmount the volume from the instance."