
530 Large Scale and Big Data
with local instance-store disks as root devices. Instance-store volumes are volatile
storages and cannot survive stops and terminations. Second, EC2 instances can be
attached to Elastic Block Storages (EBS), which provide raw block devices. The block
devices can then be formatted and mounted with any le system at EC2 instances.
EBS volumes are persistent storages and can survive stops and terminations. EBS
volumes of sizes from 1 GB to 1 TB can be dened and RAID arrays can be created
by combining two or more volumes. EBS volumes can even be attached or detached
from instances while they are running. They can a