Merge "Add NBD driver"

doc/config-reference/source/block-storage/drivers/nexentaedge-driver.rst

@@ -1,33 +1,17 @@
-========================
-NexentaEdge iSCSI driver
-========================
+===============================
+NexentaEdge NBD & iSCSI drivers
+===============================
 
 NexentaEdge is designed from the ground-up to deliver high performance Block
 and Object storage services and limitless scalability to next generation
 OpenStack clouds, petabyte scale active archives and Big Data applications.
 NexentaEdge runs on shared nothing clusters of industry standard Linux
-servers, and builds on Nexenta IP and patent pending Cloud Copy On Write(CCOW)
-technology to break new grounds in terms of reliability, functionality and
-cost efficiencies.
+servers, and builds on Nexenta IP and patent pending Cloud Copy On Write (CCOW)
+technology to break new ground in terms of reliability, functionality and cost
+efficiency.
 
 For NexentaEdge user documentation, visit http://docs.nexenta.com.
 
-Supported operations
-~~~~~~~~~~~~~~~~~~~~
-
-* Create, delete, attach, and detach volumes.
-
-* Create, list, and delete volume snapshots.
-
-* Create a volume from a snapshot.
-
-* Copy an image to a volume.
-
-* Copy a volume to an image.
-
-* Clone a volume.
-
-* Extend a volume.
 
 iSCSI driver
 ~~~~~~~~~~~~
@@ -71,13 +55,100 @@ volume driver controls:
       # Name of pre-created iSCSI service (string value)
       nexenta_iscsi_service = SERVICE-NAME
 
-      # IP address of the gateway node attached to iSCSI service above (string value)
+      # IP address of the gateway node attached to iSCSI service above or
+      # virtual IP address if an iSCSI Storage Service Group is configured in
+      # HA mode (string value)
       nexenta_client_address = GATEWAY-NODE-IP
 
 
 #. Save the changes to the ``/etc/cinder/cinder.conf`` file and
    restart the ``cinder-volume`` service.
 
+Supported operations
+--------------------
+
+* Create, delete, attach, and detach volumes.
+
+* Create, list, and delete volume snapshots.
+
+* Create a volume from a snapshot.
+
+* Copy an image to a volume.
+
+* Copy a volume to an image.
+
+* Clone a volume.
+
+* Extend a volume.
+
+
+NBD driver
+~~~~~~~~~~
+
+As an alternative to using iSCSI, Amazon S3, or Openstack Swift protocols,
+NexentaEdge can provide access to cluster storage via a Network Block Device
+(NBD) interface.
+
+The NexentaEdge cluster must be installed and configured according to the
+relevant Nexenta documentation. A cluster, tenant, bucket must be pre-created.
+The driver requires NexentaEdge Service to run on Hypervisor Node (Nova) node.
+The node must sit on Replicast Network and only runs NexentaEdge service, does
+not require physical disks.
+
+You must configure these items for each NexentaEdge cluster that the NBD
+volume driver controls:
+
+#. Make the following changes on data node ``/etc/cinder/cinder.conf``
+   file.
+
+   .. code-block:: ini
+
+      # Enable Nexenta NBD driver
+      volume_driver = cinder.volume.drivers.nexenta.nexentaedge.nbd.NexentaEdgeNBDDriver
+
+      # Specify the ip address for Rest API (string value)
+      nexenta_rest_address = MANAGEMENT-NODE-IP
+
+      # Port for Rest API (integer value)
+      nexenta_rest_port = 8080
+
+      # Protocol used for Rest calls (string value, default=htpp)
+      nexenta_rest_protocol = http
+
+      # Username for NexentaEdge Rest (string value)
+      nexenta_rest_user = USERNAME
+
+      # Password for NexentaEdge Rest (string value)
+      nexenta_rest_password = PASSWORD
+
+      # Path to bucket containing iSCSI LUNs (string value)
+      nexenta_lun_container = CLUSTER/TENANT/BUCKET
+
+      # Path to directory to store symbolic links to block devices
+      # (string value, default=/dev/disk/by-path)
+      nexenta_nbd_symlinks_dir = /PATH/TO/SYMBOLIC/LINKS
+
+
+#. Save the changes to the ``/etc/cinder/cinder.conf`` file and
+   restart the ``cinder-volume`` service.
+
+Supported operations
+--------------------
+
+* Create, delete, attach, and detach volumes.
+
+* Create, list, and delete volume snapshots.
+
+* Create a volume from a snapshot.
+
+* Copy an image to a volume.
+
+* Copy a volume to an image.
+
+* Clone a volume.
+
+* Extend a volume.
+
 
 Driver options
 ~~~~~~~~~~~~~~