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 

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. 

GLYPH<129> Storage system zones 

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. 

GLYPH<129> Host zones 

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. 

– 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. 

