Mike Perez 72ebea66b6 Adding driver minimum features and volume stats to dev doc

This is a first pass in getting information out of the wiki and into the
dev docs, so changes can be reviewed properly as discussed at the Havana
summit.

Change-Id: I75e71b3e5df69e6b507ee64d330a9ec2455266c5

2013-07-23 23:14:55 -07:00

1.9 KiB

Raw Blame History

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.

1.9 KiB Raw Blame History