NetApp Unified Driver for Data ONTAP operating in 7-Mode with iSCSI

The NetApp unified driver for Data ONTAP operating in 7-Mode with iSCSI is a driver interface from OpenStack Cinder to NetApp Data ONTAP operating in 7-Mode storage controllers to accomplish provisioning and management of a storage-area network (SAN) block storage entity; that is, a NetApp LUN that uses the iSCSI protocol.

Configuration Options

To set up the NetApp Data ONTAP operating in 7-Mode iSCSI driver for Cinder, the following stanza should be added to the Cinder configuration file (cinder.conf):

[myIscsiBackend] 
volume_backend_name=myIscsiBackend
volume_driver=cinder.volume.drivers.netapp.common.NetAppDriver
netapp_server_hostname=hostname
netapp_server_port=80
netapp_storage_protocol=iscsi 
netapp_storage_family=ontap_7mode 
netapp_login=admin_username
netapp_password=admin_password
use_multipath_for_image_xfer=True
max_over_subscription_ratio=1.0
reserved_percentage=5
consistencygroup_support = True

	Be sure that the value of the `enabled_backends` option in the `[DEFAULT]` stanza includes the name of the stanza you chose for the backend.
	The value of `netapp_storage_protocol` MUST be set to `iscsi`.
	The value of `netapp_storage_family` MUST be set to `ontap_7mode`, as the default value for this option is `ontap_cluster`.

Table 4.16, “Configuration options for Data ONTAP operating in 7-Mode with iSCSI” lists the configuration options available for the unified driver for a clustered Data ONTAP deployment that uses the iSCSI storage protocol.

Table 4.16. Configuration options for Data ONTAP operating in 7-Mode with iSCSI
Option	Type	Default Value	Description
`netapp_server_hostname`	Required		The hostname or IP address for the storage system or proxy server. The value of this option should be the IP address of either the cluster management LIF or the SVM management LIF.
`netapp_server_port`	Optional		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_login`	Required		Administrative user account name used to access the storage system or proxy server.
`netapp_password`	Required		Password for the administrative user account specified in the `netapp_login` option.
`netapp_storage_protocol`	Required		The storage protocol to be used. Valid options are `nfs` or `iscsi`.
`netapp_transport_type`	Required	`http`	Transport protocol for communicating with the storage system or proxy server. Valid options include `http` and `https`.
`netapp_size_multiplier`	Optional	1.2	When creating volumes, the quantity to be multiplied to the requested OpenStack volume size to ensure enough space is available on the SVM (aka Vserver). This value is currently only used when ISCSI has been selected as the storage protocol to be used.
`netapp_volume_list`	Deprecated		This option has been deprecated in preference of `netapp_pool_name_search_pattern`. Backwards compatibility for this option remains, but this option will be removed in a future release of OpenStack.
`netapp_vfiler`	Optional		The vFiler unit on which provisioning of block storage volumes will be done. This option is only used by the driver when connecting to an instance with a storage family of Data ONTAP operating in 7-Mode. Only use this option when utilizing the MultiStore feature on the NetApp storage system.
`netapp_storage_family`	Required	`ontap_cluster`	The storage family type used on the storage system; valid values are `ontap_7mode` for Data ONTAP operating in 7-Mode, `ontap_cluster` for clustered Data ONTAP, or `eseries` for E-Series.
`netapp_lun_ostype`	Optional	`linux`	This option defines the type of operating system that will access a LUN exported from Data ONTAP; it is assigned to the LUN at the time it is created.
`netapp_lun_space_reservation`	Optional	`enabled`	This option specifies whether space will be reserved when creating Cinder volumes on NetApp backends using the iSCSI or FC storage protocols. If this option is set to `enabled`, LUNs created during volume creation or volume cloning workflows will always be thick provisioned. If this option is set to `disabled`, LUNs created during volume creation or volume cloning workflows will always be thin provisioned. Note that this option does not affect the implementation of Cinder snapshots, where the LUN clone that represents the snapshot will always be thin provisioned. Valid options are `enabled` and `disabled`.
`netapp_host_type`	Optional	`linux`	This option defines the type of operating system for all initiators that can access a LUN. This information is used when mapping LUNs to individual hosts or groups of hosts. For a list of valid OS types, refer to the Data ONTAP documentation
`use_multipath_for_image_xfer`	Optional		If multipath has been enabled on your OpenStack hosts, then setting this option to `true` will permit Cinder to use multiple paths for increased bandwidth. Use of this option is also contingent upon a modification to the Nova configuration file `nova.conf`. The option `iscsi_use_multipath = True` must be added beneath the [libvirt] stanza contained within `nova.conf`. The inclusion of these options will not affect your OpenStack deployment in the event that multipath is not properly configured on your OpenStack hosts. Consult Recommended host settings for Linux Unified Host Utilities and Linux Unified Host Utilities Guide to configure multipath on your OpenStack hosts
`netapp_pool_name_search_pattern`	Optional	`(.+)`	This option is only utilized when the Cinder driver is configured to use iSCSI or Fibre Channel. It is used to restrict provisioning to the specified FlexVol volumes. Specify the value of this option as a regular expression which will be applied to the names of FlexVol volumes from the storage backend which represent pools in Cinder. `^` (beginning of string) and `$` (end of string) are implicitly wrapped around the regular expression specified before filtering.
`reserved_percentage`	Optional	`0`	This option represents the amount of total capacity of a storage pool that will be reserved and cannot be utilized for provisioning Cinder volumes.
`max_over_subscription_ratio`	Optional	`20.0`	This option is defined as a float, and specifies the amount of over-provisioning to allow when thin provisioning is being used in the storage pool. A value of 1.0 will mean that the provisioned capacity will not be able to exceed the total capacity, while larger values will result in increased levels of allowed over-provisioning.
`consistencygroup_support`	optional	False	Enables support for Cinder consistency groups in the driver
`filter_function`	Optional	(see description)	This option may be used to override the default filter function, which prevents Cinder from placing new volumes on storage controllers that may become overutilized. The default value is "capabilities.utilization < 70".
`goodness_function`	Optional	(see description)	This option may be used to override the default goodness function, which allows Cinder to place new volumes on lesser-utilized storage controllers. The default value is "100 - capabilities.utilization".

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