あるインスタンスIDで使用しているボリュームを aws-cli で探します。
[root@centos6 ~]# aws ec2 describe-volumes --filters "Name=attachment.instance-id,Values=i-bca3812f" --output table --------------------------------------------------------- | DescribeVolumes | +-------------------------------------------------------+ || Volumes || |+---------------------+-------------------------------+| || AvailabilityZone | us-east-1b || || CreateTime | 2016-11-19T06:41:58.265Z || || Encrypted | False || || Iops | 100 || || Size | 8 || || SnapshotId | snap-9dc0730b || || State | in-use || || VolumeId | vol-c962b558 || || VolumeType | gp2 || |+---------------------+-------------------------------+| ||| Attachments ||| ||+----------------------+----------------------------+|| ||| AttachTime | 2016-11-19T06:41:58.000Z ||| ||| DeleteOnTermination | True ||| ||| Device | /dev/sda1 ||| ||| InstanceId | i-bca3812f ||| ||| State | attached ||| ||| VolumeId | vol-c962b558 ||| ||+----------------------+----------------------------+||