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AFAIK, there isn't any Cinder API for checking the volume (usage) stats, you can use Ceilometer to get that. However, for a basic status check of volume, the Cinder show volume info API is available. The volume expand API is an extension (and is available), however, unfortunately not all extensions are documented (currently only backup API is documented). Executing the CLI 'cinder extend vol-id size' with the 'debug' flag should give you the API details!