These RDMA-capable adapters must be installed in the same slots across all the nodes of  the system. These installation requirements ensure that port identifiers are the same  across all nodes in the system. GLYPH<SM590000> Ethernet cables between each node are connected correctly. GLYPH<SM590000> The protocol technology on the source and destination adapters is the same. GLYPH<SM590000> The local and remote IP addresses can be reached. GLYPH<SM590000> Each IP address for RDMA-capable Ethernet ports and their associated subnet masks are  unique on each node. GLYPH<SM590000> Routers must not be placed between nodes that use RDMA-capable Ethernet ports for  node-to-node communication. GLYPH<SM590000> The negotiated speeds on the local and remote adapters are the same. GLYPH<SM590000> The local and remote port virtual LAN identifiers are the same. Use virtual LAN to create  physical separation of networks for unrelated systems, wherever possible. All the ports  that are used for node-to node communication must be assigned with one VLAN ID, and  ports that are used for host attachment must have a different VLAN ID.  GLYPH<SM590000> A minimum of two dedicated RDMA-capable Ethernet ports are required for node-to-node  communications to ensure best performance and reliability. These ports must be  configured for inter-node traffic only, and must not be used for host attachment,  virtualization of Ethernet-attached external storage, or IP replication traffic. GLYPH<SM590000> A maximum of four RDMA-capable Ethernet ports per node are allowed for node-to-node  communications. If you plan to use VLAN to create this separation, you must configure VLAN support on the  all the Ethernet switches in your network before you define the RDMA-capable Ethernet  ports on nodes in the system. On each switch in your network, set VLAN to Trunk mode  and specify the VLAN ID for the RDMA-ports that will be in the same VLAN.  In addition, if VLAN settings for a RDMA-capable Ethernet port need to be updated, these  settings cannot be updated independently of other configuration settings. Before you  update VLAN settings on specific RDMA-capable Ethernet ports, you must unconfigure  the port, make any necessary changes to the switch configuration, then reconfigure  RDMA-capable Ethernet ports on each of the nodes in the system. You can also use volume mirroring when you migration volume from existing storage to IBM  SVC and Storwize V7000. As you can see in Figure 4-16 on page 165, you first need to  attach existing storage to IBM SVC and Storwize V7000 by using a virtualization solution.  In this case, you need some downtime to attach storage to IBM SVC and Storwize V7000.  Next, attach mirrored volumes to hosts so that the host can recognize volumes same as  existing ones. You can now restart applications. Volume mirroring is implemented with  background after sync starts. 164  IBM System Storage SAN Volume Controller, IBM Storwize V7000, and IBM FlashSystem 7200 Best 4.8.5 Migrating with volume mirroring