26510e84dd
Change-Id: Ia9dc15869ab201a787eecd479252282f0ae9113b Implements: blueprint config-ref-rst
77 lines
2.9 KiB
ReStructuredText
77 lines
2.9 KiB
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==============================================
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iSCSI interface and offload support in Compute
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==============================================
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.. note::
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iSCSI interface and offload support is only present since Kilo.
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Compute supports open-iscsi iSCSI interfaces for offload cards.
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Offload hardware must be present and configured on every compute
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node where offload is desired. Once an open-iscsi interface is
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configured, the iface name (``iface.iscsi_ifacename``) should be
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passed to libvirt via the ``iscsi_iface`` parameter for use.
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All iSCSI sessions will be bound to this iSCSI interface.
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Currently supported transports (``iface.transport_name``) are
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``be2iscsi``, ``bnx2i``, ``cxgb3i``, ``cxgb4i``, ``qla4xxx``, ``ocs``.
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Configuration changes are required on the compute node only.
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iSER is supported using the separate iSER LibvirtISERVolumeDriver
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and will be rejected if used via the iscsi_iface parameter.
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iSCSI iface configuration
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~~~~~~~~~~~~~~~~~~~~~~~~~
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* Note the distinction between the transport name (``iface.transport_name``)
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and iface name (``iface.iscsi_ifacename``). The actual iface name must be
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specified via the iscsi_iface parameter to libvirt for offload to work.
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* The default name for an iSCSI iface (open-iscsi parameter
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``iface.iscsi_ifacename``) is in the format transport_name.hwaddress
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when generated by ``iscsiadm``.
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* ``iscsiadm`` can be used to view and generate current iface configuration.
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Every network interface that supports an open-iscsi transport can have one
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or more iscsi ifaces associated with it. If no ifaces have been configured
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for a network interface supported by an open-iscsi transport,
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this command will create a default iface configuration for that
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network interface. For example :
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.. code-block:: console
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# iscsiadm -m iface
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default tcp,<empty>,<empty>,<empty>,<empty>
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iser iser,<empty>,<empty>,<empty>,<empty>
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bnx2i.00:05:b5:d2:a0:c2 bnx2i,00:05:b5:d2:a0:c2,5.10.10.20,<empty>,<empty>
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The output is in the format:
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``iface_name transport_name,hwaddress,ipaddress,
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net_ifacename,initiatorname``.
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* Individual iface configuration can be viewed via
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.. code-block:: console
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# iscsiadm -m iface -I IFACE_NAME
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# BEGIN RECORD 2.0-873
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iface.iscsi_ifacename = cxgb4i.00:07:43:28:b2:58
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iface.net_ifacename = <empty>
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iface.ipaddress = 102.50.50.80
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iface.hwaddress = 00:07:43:28:b2:58
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iface.transport_name = cxgb4i
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iface.initiatorname = <empty>
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# END RECORD
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Configuration can be updated as desired via
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.. code-block:: console
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# iscsiadm -m iface-I IFACE_NAME--op=update -n iface.SETTING -v VALUE
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* All iface configurations need a minimum of ``iface.iface_name``,
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``iface.transport_name`` and ``iface.hwaddress`` to be correctly
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configured to work. Some transports may require ``iface.ipaddress``
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and ``iface.net_ifacename`` as well to bind correctly.
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Detailed configuration instructions can be found at
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http://www.open-iscsi.org/docs/README.
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