Chapter 11. Advanced Copy Services 517
3. Create the A → C relationship (or the B → C relationship).
4. Synchronize to system C, and ensure that A → C is established:
–A → B, A → C, A → D, B → C, B → D, and C → D
–A → B, A → C, and B → C
Figure 11-84 shows an example of a triangle topology (A → B, A → C, and B → C).
Figure 11-84   Triangle topology
Figure 11-85 shows an example of a fully connected topology (A→ B, A → C, A → D, B → D, 
and C → D).
Figure 11-85   Fully connected topology
Figure 11-85 is a fully connected mesh in which every system has a partnership to each of 
the three other systems. This topology enables volumes to be replicated between any pair of 
systems, for example A → B, A → C, and B → C.
Figure 11-86 shows a daisy-chain topology. 
Figure 11-86   Daisy-chain topology
Although systems can have up to three partnerships, volumes can be part of only one remote 
copy relationship, for example A → B.
System partnership intermix: All of the preceding topologies are valid for the intermix of 
the IBM SAN Volume Controller with the Storwize V7000 if the Storwize V7000 is set to the 
replication layer and running IBM Spectrum Virtualize code 6.3.0 or later.