Without solid storage, the data of the cloud lives only in the moment. Within OpenStack, storage comes in two flavors: object storage, which stores chunks of information, and block storage, which is more analogous to the traditional idea of a disk drive image. Block storage in OpenStack is handled by Cinder, which provides the infrastructure for managing volumes and sharing them with the other components in OpenStack.
March 18, 2014
How Openstack Stores Data in the Cloud with Cinder
Read more at OpenSource.com