Currently the engine (via the RESTAPI) doesn't report the WWN (world wide names) of the SCSI initiators and targets for fiber channel storage domains. For example:

  <logical_unit id="3600014400000001070605fc6b86f0000">
    <serial>myserial</serial>
    <vendor_id>myvendor</vendor_id>
    <product_id>myuproduct</product_id>
    <lun_mapping>0</lun_mapping>
    <size>53687091200</size>
    <paths>4</paths>
    <status>used</status>
  </logical_unit>

This information doesn't include the WWN of the initiator or the target.

For iSCSI the target is reported, in the form of a iSCSI IQN, but the initiator WWN is also missing:

  <logical_unit id="3600a09803752706c3224462d72794500">
    <port>3260</port>
    <target>iqn.2015-09.com.example:mytarget</target>
    <portal>...</portal>
    <address>...</address>
    <serial>...</serial>
    <vendor_id>myvendor</vendor_id>
    <product_id>myproduct</product_id>
    <lun_mapping>0</lun_mapping>
    <size>107374182400</size>
    <paths>0</paths>
    <volume_group_id>...</volume_group_id>
    <storage_domain_id>...</storage_domain_id>
  <logical_unit>

This RFE is about reporting the initiator and target WWN in all cases, for example:

  <logical_unit id="3600014400000001070605fc6b86f0000">
    <initiator>
      <wwn>myinitiatorwwn</wwn>
    </initiator>
    <target>
      <wwn>mytargetwwn</wwn>
    </target>
    ...
  </logical_unit>

As the initiators are more related to the host than to a specific LU it may be better to create a new "/hosts/{host:id}/scsiinitiators" collection:

  GET /hosts/{host:id}/scsiinitiators
  <scsi_initiators>
    <scsi_initiator id="..." href="...">
      <wwn>myinitiator1wwwn</wwn>
    </scsi_initiator>
    <scsi_initiator id="..." hef="...">
      <wwn>myinitiator2wwwn</wwn>
    </scsi_initiator>
    ...
  </scsi_initiators>

Same for the targets. The LU can then report them using links:

  <logical_unit ...>
    <initiator id="..." href="/hosts/{host:id}/scsiinitiators/..."/>
    <target id="..." href="/hosts/{host:id}/scsitargets/..."/>
  </logical_unit>