SambaFS driver

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There is a volume back-end for Samba filesystems. Set the following in your cinder.conf, and use the following options to configure it.

	Note
	The SambaFS driver requires qemu-img version 1.7 or higher on Linux nodes, and qemu-img> version 1.6 or higher on Windows nodes.

volume_driver=cinder.volume.drivers.smbfs.SmbfsDriver

Table 2.40. 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.
`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.