Drivers

Cinder exposes an API to users to interact with different storage backend solutions. The following are standards across all drivers for Cinder services to properly interact with a driver.

Minimum Features

Minimum features are enforced to avoid having a grid of what features are supported by which drivers and which releases. Cinder Core requires that all drivers implement the following minimum features.

Havana

• Volume Create/Delete
• Volume Attach/Detach
• Snapshot Create/Delete
• Create Volume from Snapshot
• Get Volume Stats
• Copy Image to Volume
• Copy Volume to Image
• Clone Volume

Icehouse

• All of the above plus
• Extend Volume

Volume Stats

Volume stats are used by the different schedulers for the drivers to provide a report on their current state of the backend. The following should be provided by a driver.

• driver_version
• free_capacity_gb
• reserved_percentage
• storage_protocol
• total_capacity_gb
• vendor_name
• volume_backend_name

NOTE: If the driver is unable to provide a value for free_capacity_gb or total_capacity_gb, keywords can be provided instead. Please use ‘unknown’ if the array cannot report the value or ‘infinite’ if the array has no upper limit.