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Figure 5-5 shows a general Multi-Target PPRC topology where a single primary site is replicated to two secondary sites. Host I/O is directed to the H1 site and Multi-Target PPRC mirrors the updates to both H2 and H3. 

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A primary volume can have any combination of two Metro Mirror, Gl obal Copy, or Global Mirror relationships, with a restriction that a primary volume can be long to only one Global Mirror session at a time. 

Note:  A volume can be in only one Global Mirror session. 

Little extra host response time impact occurs with two relationships c ompared to one relationship of the same type. Multi-Target PPRC is available in both  open systems and z Systems environments. 

For more information, see IBM DS8870 Multiple Target Peer-to-Pe er Remote Copy , REDP-5151. 

