iSCSI interface and offload support in Compute¶

iSCSI iface configuration¶

• Note the distinction between the transport name (iface.transport_name) and iface name (iface.iscsi_ifacename). The actual iface name must be specified via the iscsi_iface parameter to libvirt for offload to work.

• The default name for an iSCSI iface (open-iscsi parameter iface.iscsi_ifacename) is in the format transport_name.hwaddress when generated by iscsiadm.

• iscsiadm can be used to view and generate current iface configuration. Every network interface that supports an open-iscsi transport can have one or more iscsi ifaces associated with it. If no ifaces have been configured for a network interface supported by an open-iscsi transport, this command will create a default iface configuration for that network interface. For example :

  # iscsiadm -m iface
  default tcp,<empty>,<empty>,<empty>,<empty>
  iser iser,<empty>,<empty>,<empty>,<empty>
  bnx2i.00:05:b5:d2:a0:c2 bnx2i,00:05:b5:d2:a0:c2,5.10.10.20,<empty>,<empty>
  

  The output is in the format: iface_name transport_name,hwaddress,ipaddress, net_ifacename,initiatorname.

• Individual iface configuration can be viewed via

  # iscsiadm -m iface -I IFACE_NAME
  # BEGIN RECORD 2.0-873
  iface.iscsi_ifacename = cxgb4i.00:07:43:28:b2:58
  iface.net_ifacename = <empty>
  iface.ipaddress = 102.50.50.80
  iface.hwaddress = 00:07:43:28:b2:58
  iface.transport_name = cxgb4i
  iface.initiatorname = <empty>
  # END RECORD
  

  Configuration can be updated as desired via

  # iscsiadm -m iface-I IFACE_NAME--op=update -n iface.SETTING -v VALUE
  

• All iface configurations need a minimum of iface.iface_name, iface.transport_name and iface.hwaddress to be correctly configured to work. Some transports may require iface.ipaddress and iface.net_ifacename as well to bind correctly.

  Detailed configuration instructions can be found at http://www.open-iscsi.org/docs/README.