Using block storage service: Cinder

Cinder provides persistent storage management for the virtual machine's hard drives. Unlike ephemeral storage, virtual machines backed by Cinder volumes can be easily live-migrated and evacuated. In prior OpenStack releases, block storage was a part of the compute service in OpenStack nova-volume. Within its overwhelmed new features, block storage service has been evolved and taken a separate spot in the OpenStack ecosystem so renamed as Cinder. Under the hood, volumes expose a raw block of storage that can be attached to instances and can store data permanently. The attached volume appears as an additional hard-drive within the virtual machine. To use the attached volume within a virtual machine, it must be first partitioned and laid with a filesystem and mounted on to the filesystem hierarchy on the virtual machine.

Cinder uses iSCSI, NFS, and fiber channels to present the block device to the virtual machine. Moreover, Cinder helps you manage the quotas...