d. If you are migrating external storage systems that connect to the system that uses  Fibre Channel or Fibre Channel over Ethernet connections, ensure that you complete  appropriate zoning changes to simplify migration. Use the following guidelines to  ensure that zones are configured correctly for migration: GLYPH<129>Z o n i g  r u l e s GLYPH<129> Storage system zones GLYPH<129> Host zones – Because the SVC should now be seen as a  host cluster from the external system to be  migrated, you must define the SVC as a host or host group by using the WWPNs or  IQNs, on the system to be migrated. Some legacy systems do not permit LUN-to-host  mapping and would then present all the LUs to the SVC. In that case, all the LUs  should be migrated. 7. If the previous preparation steps have been followed, the SVC is now seen as a host from  the system to be migrated. LUs can then be mapped to the SVC. Map the external storage  system by following the on-screen instructions that are shown in Figure 9-6 on page 417. 416  Implementing the IBM System Storage SAN Volume Controller with IBM Spectrum Virtualize V8.2.1 For every storage system, create one zone that contains this system’s ports from  every node and all external storage system ports, unless otherwise stated by the  zoning guidelines for that storage system.  This system requires single-initiator zoning for all large configurations that contain  more than 64 host objects. Each server Fibre Channel port must be in its own zone,  which contains the Fibre Channel port and this system’s ports. In configurations of  fewer than 64 hosts, you can have up to 40 Fibre Channel ports in a host zone if the  zone contains similar HBAs and operating systems. In a storage system zone, this system’s  nodes identify the storage systems.  Generally, create one zone for each storage system. Host systems cannot operate  on the storage systems directly. All data transfer occurs through this system’s  nodes. In the host zone, the host systems can identify and address this system’s nodes.  You can have more than one host zone and more than one storage system zone.  Create one host zone for each host Fibre Channel port.