Description of Samba volume driver configuration options

Configuration option = Default value	Description
[DEFAULT]
smbfs_default_volume_format = qcow2	(StrOpt) Default format that will be used when creating volumes if no volume format is specified. Can be set to: raw, qcow2, vhd or vhdx.
smbfs_mount_options = noperm,file_mode=0775,dir_mode=0775	(StrOpt) Mount options passed to the smbfs client. See mount.cifs man page for details.
smbfs_mount_point_base = $state_path/mnt	(StrOpt) Base dir containing mount points for smbfs shares.
smbfs_oversub_ratio = 1.0	(FloatOpt) This will compare the allocated to available space on the volume destination. If the ratio exceeds this number, the destination will no longer be valid.
smbfs_shares_config = /etc/cinder/smbfs_shares	(StrOpt) File with the list of available smbfs shares.
smbfs_sparsed_volumes = True	(BoolOpt) Create volumes as sparsed files which take no space rather than regular files when using raw format, in which case volume creation takes lot of time.
smbfs_used_ratio = 0.95	(FloatOpt) Percent of ACTUAL usage of the underlying volume before no new volumes can be allocated to the volume destination.