Description of configuration options for storage_nfs

Configuration option=Default value	Description
nfs_mount_options=None	(StrOpt) Mount options passed to the nfs client. See section of the nfs man page for details.
nfs_mount_point_base=$state_path/mnt	(StrOpt) Base dir containing mount points for nfs shares.
nfs_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.
nfs_shares_config=/etc/cinder/nfs_shares	(StrOpt) File with the list of available nfs shares
nfs_sparsed_volumes=True	(BoolOpt) Create volumes as sparsed files which take no space.If set to False volume is created as regular file.In such case volume creation takes a lot of time.
nfs_used_ratio=0.95	(FloatOpt) Percent of ACTUAL usage of the underlying volume before no new volumes can be allocated to the volume destination.