IBM DS6000 - Manual (Page 301)

Chapter 23. Global Mirror options and configuration 277
Note that when you configure links over a SAN network, the same FCP ports of the storage
disk subsystem may be used for the Global Mirror session communication, as well as for the
Global Copy communication, and for host connectivity. However, for performance reasons,
and to prevent host errors from disrupting your Global Mirror environment, it is often a good
idea to use separate FCP ports.
Figure 23-4 Global Mirror paths over FCP links between primary storage disk subsystems
The sample configuration in Figure 23-5 shows a mix of dedicated and shared FCP ports.
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Local site Remote site