Cinder Block Storage service overview¶
The OpenStack Block Storage service (Cinder) adds persistent storage to a virtual machine. Block Storage provides an infrastructure for managing volumes, and interacts with OpenStack Compute to provide volumes for instances. The service also enables management of volume snapshots, and volume types.
The Block Storage service consists of the following components:
Accepts API requests, and routes them to the
Interacts directly with the Block Storage service, and processes such as the
cinder-scheduler. It also interacts with these processes through a message queue. The
cinder-volumeservice responds to read and write requests sent to the Block Storage service to maintain state. It can interact with a variety of storage providers through a driver architecture.
- cinder-scheduler daemon
Selects the optimal storage provider node on which to create the volume. A similar component to the
- cinder-backup daemon
cinder-backupservice provides backing up volumes of any type to a backup storage provider. Like the
cinder-volumeservice, it can interact with a variety of storage providers through a driver architecture.
- Messaging queue
Routes information between the Block Storage processes.