Elastic block storage
EBS volumes are attached to your instance via the network. Because of this, they have a separate lifecycle and can persist even after you terminate your instance, so you can freely stop and start EBS-backed instances. To further improve their durability, the data is mirrored on two devices. Since they are network-connected to your instance, you should ideally use them with instances that are EBS-optimized, which will give you a more consistent disk throughput. You can provision the size of your EBS volumes however you want, from 1 GB up to 16 TB. You can also attach multiple EBS volumes to a single instance, and also RAID them if you like. However, like a physical disk drive, they can only be attached to one instance ...
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