NetApp NFS configuration for clustered Data ONTAP

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The NetApp NFS configuration for clustered Data ONTAP is an interface from OpenStack to a clustered Data ONTAP system for provisioning and managing OpenStack volumes on NFS exports provided by the clustered Data ONTAP system that are accessed using the NFS protocol.

The NFS configuration for clustered Data ONTAP is a direct interface from OpenStack Block Storage to the clustered Data ONTAP instance and as such does not require any additional management software to achieve the desired functionality. It uses NetApp APIs to interact with the clustered Data ONTAP instance.

Configuration options for the clustered Data ONTAP family with NFS protocol

Configure the volume driver, storage family, and storage protocol to NetApp unified driver, clustered Data ONTAP, and NFS respectively by setting the volume_driver, netapp_storage_family and netapp_storage_protocol options in cinder.conf as follows:

volume_driver = cinder.volume.drivers.netapp.common.NetAppDriver
netapp_storage_family = ontap_cluster
netapp_storage_protocol = nfs
netapp_vserver = openstack-vserver
netapp_server_hostname = myhostname
netapp_server_port = port
netapp_login = username
netapp_password = password
nfs_shares_config = /etc/cinder/nfs_shares

Table 1.18. Description of NetApp cDOT NFS driver configuration options
Configuration option = Default value	Description
[DEFAULT]
expiry_thres_minutes = 720	(IntOpt) This option specifies the threshold for last access time for images in the NFS image cache. When a cache cleaning cycle begins, images in the cache that have not been accessed in the last M minutes, where M is the value of this parameter, will be deleted from the cache to create free space on the NFS share.
netapp_copyoffload_tool_path = None	(StrOpt) This option specifies the path of the NetApp copy offload tool binary. Ensure that the binary has execute permissions set which allow the effective user of the cinder-volume process to execute the file.
netapp_login = None	(StrOpt) Administrative user account name used to access the storage system or proxy server.
netapp_password = None	(StrOpt) Password for the administrative user account specified in the netapp_login option.
netapp_server_hostname = None	(StrOpt) The hostname (or IP address) for the storage system or proxy server.
netapp_server_port = None	(IntOpt) The TCP port to use for communication with the storage system or proxy server. If not specified, Data ONTAP drivers will use 80 for HTTP and 443 for HTTPS; E-Series will use 8080 for HTTP and 8443 for HTTPS.
netapp_storage_family = ontap_cluster	(StrOpt) The storage family type used on the storage system; valid values are ontap_7mode for using Data ONTAP operating in 7-Mode, ontap_cluster for using clustered Data ONTAP, or eseries for using E-Series.
netapp_storage_protocol = None	(StrOpt) The storage protocol to be used on the data path with the storage system; valid values are iscsi or nfs.
netapp_transport_type = http	(StrOpt) The transport protocol used when communicating with the storage system or proxy server. Valid values are http or https.
netapp_vserver = None	(StrOpt) This option specifies the virtual storage server (Vserver) name on the storage cluster on which provisioning of block storage volumes should occur. If using the NFS storage protocol, this parameter is mandatory for storage service catalog support (utilized by Cinder volume type extra_specs support). If this option is specified, the exports belonging to the Vserver will only be used for provisioning in the future. Block storage volumes on exports not belonging to the Vserver specified by this option will continue to function normally.
thres_avl_size_perc_start = 20	(IntOpt) If the percentage of available space for an NFS share has dropped below the value specified by this option, the NFS image cache will be cleaned.
thres_avl_size_perc_stop = 60	(IntOpt) When the percentage of available space on an NFS share has reached the percentage specified by this option, the driver will stop clearing files from the NFS image cache that have not been accessed in the last M minutes, where M is the value of the expiry_thres_minutes configuration option.

	Note
	Additional NetApp NFS configuration options are shared with the generic NFS driver. These options can be found here: Table 1.25, “Description of NFS storage configuration options”.

	Note
	If you specify an account in the `netapp_login` that only has virtual storage server (Vserver) administration privileges (rather than cluster-wide administration privileges), some advanced features of the NetApp unified driver will not work and you may see warnings in the OpenStack Block Storage logs.

NetApp NFS Copy Offload client

A feature was added in the Icehouse release of the NetApp unified driver that enables Image Service images to be efficiently copied to a destination Block Storage volume. When the Block Storage and Image Service are configured to use the NetApp NFS Copy Offload client, a controller-side copy will be attempted before reverting to downloading the image from the Image Service. This improves image provisioning times while reducing the consumption of bandwidth and CPU cycles on the host(s) running the Image and Block Storage services. This is due to the copy operation being performed completely within the storage cluster.

The NetApp NFS Copy Offload client can be used in either of the following scenarios:

The Image Service is configured to store images in an NFS share that is exported from a NetApp FlexVol volume and the destination for the new Block Storage volume will be on an NFS share exported from a different FlexVol volume than the one used by the Image Service. Both FlexVols must be located within the same cluster.
The source image from the Image Service has already been cached in an NFS image cache within a Block Storage backend. The cached image resides on a different FlexVol volume than the destination for the new Block Storage volume. Both FlexVols must be located within the same cluster.

To use this feature, you must configure the Image Service, as follows:

Set the default_store configuration option to file.
Set the filesystem_store_datadir configuration option to the path to the Image Service NFS export.
Set the show_image_direct_url configuration option to True.
Set the show_multiple_locations configuration option to True.
Set the filesystem_store_metadata_file configuration option to a metadata file. The metadata file should contain a JSON object that contains the correct information about the NFS export used by the Image Service, similar to:
```
{
    "share_location": "nfs://192.168.0.1/myGlanceExport",
    "mount_point": "/var/lib/glance/images",
    "type": "nfs"
}
```

To use this feature, you must configure the Block Storage service, as follows:

Set the netapp_copyoffload_tool_path configuration option to the path to the NetApp Copy Offload binary.
Set the glance_api_version configuration option to 2.

	Important
	This feature requires that: The storage system must have Data ONTAP v8.2 or greater installed. The vStorage feature must be enabled on each storage virtual machine (SVM, also known as a Vserver) that is permitted to interact with the copy offload client. To configure the copy offload workflow, enable NFS v4.0 or greater and export it from the SVM.

	Tip
	To download the NetApp copy offload binary to be utilized in conjunction with the `netapp_copyoffload_tool_path` configuration option, please visit the Utility Toolchest page at the NetApp Support portal (login is required).

	Tip
	For more information on these options and other deployment and operational scenarios, visit the NetApp OpenStack Deployment and Operations Guide.

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