IBM XIV Storage System Copy Services and Migration

4.4.3 Connecting XIV mirroring portsAfter defining remote mirroring targets, one-to-one connections must be made between portson each XIV system. For an illustration of these actions using the GUI or the XCLI, refer to4.11, “Using the GUI or XCLI for Remote Mirroring actions” on page 113.► FC portsFor XIV Fibre Channel (FC) ports, connections are unidirectional—from an initiator port(port 4 is configured as a Fibre Channel initiator by default) on the source XIV system to atarget port (typically port 2) on the target XIV system. Use a minimum of four connections(two connections in each direction, from ports in two different modules, using a total ofeight ports) to provide availability protection. Connections must be made between ports onmodules with the same number on each XIV system (for example, from module 9 tomodule 9 and from module 6 to module 6, as shown in Figure 4-24).9876Data,5,Data, Mgt 4 ,MgtFC SANFC SAN9876Data,5,Data, Mgt 4 ,MgtFigure 4-24 Connecting XIV mirroring ports (FC connections)►In Figure 4-24, the solid lines represent mirroring connections used during normaloperation (the mirroring target system is on the right), and the dotted lines representmirroring connections used when production is running at the disaster recovery site andchanges are being copied back to the original production site (mirroring target is on theleft.)XIV Fibre Channel ports may be easily and dynamically configured as initiator or targetports.iSCSI portsFor iSCSI ports, connections are bi-directional.Use a minimum of two connections (with each of these ports in a different module) using atotal of four ports to provide availability protection. In Figure 4-25 on page 92, the solidlines represent data flow during normal operation and the dotted lines represent data flowwhen production is running at the disaster recovery site and changes are being copiedback to the original production site.Chapter 4. Remote Mirroring 91