Figure 3-2 Storwize V7000 zoning classes Storwize V7000 supports the use of mixed fabrics for communication between nodes. The  10 GbE FCoE ports of one Storwize V7000 can be zoned to the FC ports of another node that  is part of the same clustered system. Mixed port speeds are not possible for intracluster communication. All node ports within a  clustered system must be running at the same speed.  Each Storwize V7000 port must be zoned so that it can be used for internode  communications. A system node cannot have more than 16 paths to another node in the  same system. The Storwize V7000 cluster system zone is required only if you deploy solution with more  than one control enclosure. The purpose of cluster system zone is to enable traffic between  all Storwize V7000 nodes within the clustered system. This traffic consists of heartbeats,  cache synchronization, and other data that nodes must exchange to maintain a healthy  cluster state. The FCoE fabric uses the same set of zoning rules as the Fibre Channel fabric. Note:  Configurations that use Metro Mirror, Global Mirror, N_Port ID Virtualization, or  long-distance links have extra zoning requirements. Do not follow only the general zoning  rules if you plan to use any of these. The fundamental rules of Storwize V7000 zoning are described next. However, also review  the latest zoning guidelines and requirements when designing zoning for the planned solution  by searching for “SAN configuration and zoning rules summary” at  IBM Knowledge Center. Figure 3-2 shows the Storwize V7000 zoning classes. 3.6.3 Storwize V7000 cluster system zone 52  Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1