content_image/999925.jpg
Figure 3-10 shows a storage subsystem zoning example. 

<img src='content_image/999925.jpg'>

There might be particular zoning rules governing attachment of specific back-end storage systems. Review the guidelines at the following website to verify whether you need to consider additional policies when planning zoning for your back end systems: 

## 3.6.5 Host zones 

https://ibm.biz/BdzPhi 

Hosts must be zoned to the I/O Group to be able to access volumes presented by this I/O Group. 

The preferred zoning policy is to create a separate zone for each host HBA port, and place exactly one port from each node in each I/O group that the host accesses in this zone. For deployments with more than 64 hosts defined in the system, this host zoning scheme is mandatory. 

If you plan to use NPIV, review additional host zoning requirements on IBM Knowledge Center: 

https://ibm.biz/BdzPhj 

When a dual-core SAN design is used, it is a requirement that no internode communications use the ISL link. When you create host zones in this type of configuration, ensure that each system port in the host zone is attached to the same Fibre Channel switch. 

