Amazon Elastic Block Store Concepts

Internal

• Amazon Elastic Block Storage

Block Device Mapping

• External: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html

Each instance has a root device volume.

A block device is a storage device that moves data in sequences of bytes or bits (blocks). These devices support random access and generally use buffered I/O. Examples include hard disks, CD-ROM drives, and flash drives. A block device can be physically attached to a computer or accessed remotely as if it were physically attached to the computer.

Amazon EC2 supports two types of block devices:

• Instance store volumes - virtual devices whose underlying hardware is physically attached to the host computer for the instance.
• EBS volumes - remote storage devices.

Volume

Each volume has a volume ID