NetApp-supported extra specs for clustered Data ONTAP

Extra specs enable vendors to specify extra filter criteria that the Block Storage scheduler uses when it determines which volume node should fulfill a volume provisioning request. When you use the NetApp unified driver with a clustered Data ONTAP storage system, you can leverage extra specs with OpenStack Block Storage volume types to ensure that OpenStack Block Storage volumes are created on storage back ends that have certain properties. For example, when you configure QoS, mirroring, or compression for a storage back end.

Extra specs are associated with OpenStack Block Storage volume types, so that when users request volumes of a particular volume type, the volumes are created on storage back ends that meet the list of requirements. For example, the back ends have the available space or extra specs. You can use the specs in the following table when you define OpenStack Block Storage volume types by using the cinder type-key command.

Table 1.16. Description of extra specs options for NetApp Unified Driver with Clustered Data ONTAP
Extra spec	Type	Description
`netapp:raid_type`	String	Limit the candidate volume list based on one of the following raid types: `raid4, raid_dp`.
`netapp:disk_type`	String	Limit the candidate volume list based on one of the following disk types: `ATA, BSAS, EATA, FCAL, FSAS, LUN, MSATA, SAS, SATA, SCSI, XATA, XSAS, or SSD.`
`netapp:qos_policy_group`	String	Limit the candidate volume list based on the name of a QoS policy group, which defines measurable Service Level Objectives that apply to the storage objects with which the policy group is associated.
`netapp_mirrored`^[a]	Boolean	Limit the candidate volume list to only the ones that are mirrored on the storage controller.
`netapp_unmirrored`^[a]	Boolean	Limit the candidate volume list to only the ones that are not mirrored on the storage controller.
`netapp_dedup`^[a]	Boolean	Limit the candidate volume list to only the ones that have deduplication enabled on the storage controller.
`netapp_nodedup`^[a]	Boolean	Limit the candidate volume list to only the ones that have deduplication disabled on the storage controller.
`netapp_compression`^[a]	Boolean	Limit the candidate volume list to only the ones that have compression enabled on the storage controller.
`netapp_nocompression`^[a]	Boolean	Limit the candidate volume list to only the ones that have compression disabled on the storage controller.
`netapp_thin_provisioned`^[a]	Boolean	Limit the candidate volume list to only the ones that support thin provisioning on the storage controller.
`netapp_thick_provisioned`^[a]	Boolean	Limit the candidate volume list to only the ones that support thick provisioning on the storage controller.
^[a]If both the positive and negative specs for a pair are specified (for example, `netapp_dedup` and `netapp_nodedup`) and set to the same value within a single `extra_specs` list, then neither spec will be utilized by the driver.

	Note
	It is recommended to only set the value of extra specs to `True` when combining multiple specs to enforce a certain logic set. If you desire to remove volumes with a certain feature enabled from consideration from the OpenStack Block Storage volume scheduler, be sure to use the negated spec name with a value of `True` rather than setting the positive spec to a value of `False`.

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