NetApp Unified Driver for ONTAP with iSCSI¶

The NetApp unified driver for ONTAP with iSCSI is a driver interface from OpenStack Cinder to NetApp ONTAP 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.

To set up the NetApp ONTAP 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_storage_protocol=iscsi
netapp_storage_family=ontap_cluster
netapp_login=admin_username
netapp_password=admin_password
netapp_vserver=svm_name
max_over_subscription_ratio=1.0
reserved_percentage=5
use_multipath_for_image_xfer=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.

Table 4.21, “Configuration options for ONTAP with iSCSI” below lists the configuration options available for the unified driver for an ONTAP deployment that uses the iSCSI storage protocol.

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, ONTAP drivers will use 80 for HTTP and 443 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`, `iscsi`, or `fc`.
`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. Deprecated - use reserved_percentage instead.
`netapp_vserver`	Required		This option specifies the storage virtual machine (previously called a Vserver) name on the storage cluster on which provisioning of block storage volumes should occur.
`netapp_storage_family`	Optional	`ontap_cluster`	The storage family type used on the storage system; valid values are `ontap_cluster`, for ONTAP systems.
`netapp_lun_ostype`	Optional	`linux`	This option defines the type of operating system that will access a LUN exported from ONTAP; it is assigned to the LUN at the time it is created.
`trace_flags`	Optional		This option is a comma-separated list of options (valid values include `method` and `api`) that controls which trace info is written to the Cinder logs when the debug level is set to `True`.
`netapp_api_trace_pattern`	Optional	`(.+)`	A regular expression to limit the API tracing. This option is honored only if enabling `api` tracing with the `trace_flags` option. By default, all APIs will be traced.
`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 ONTAP documentation
`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.
`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.
`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
`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”.
`use_chap_auth`	Optional		This option is defined as a boolean, and specifies if unidirectional CHAP is enabled. Provides authenticated communication between iSCSI initiators and targets. For ONTAP the TCP port 22 (SSH) on the cluster management LIF must be open and available to set CHAP authentication credentials on the storage system.

Table 4.21. Configuration Options for ONTAP with iSCSI

Caution

If you specify an account in the netapp_login option that only has SVM administration privileges (rather than cluster administration privileges), some advanced features of the NetApp unified driver will not work and you may see warnings in the Cinder logs. See the section called “Account Permission Considerations” for more details on the required access level permissions for an SVM admin account.