562 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
Two 2-node systems with two inter-site links, as shown in Figure 11-102 (configuration 5).
Figure 11-102   Dual links with two remote copy groups on each system configured
As shown in Figure 11-102, remote copy port groups 1 and 2 are configured on the nodes 
in System A and System B because two inter-site links are available. In this configuration, 
the failover ports are not configured on partner nodes in the I/O group. Instead, the ports 
are maintained in different remote copy port groups on both of the nodes. They remain 
active and participate in IP partnership by using both of the links. 
However, if either of the nodes in the I/O group fail (that is, if Node A1 on System A fails), 
the IP partnership continues only from the available IP port that is configured in remote 
copy port group 2. Therefore, the effective bandwidth of the two links is reduced to 50% 
because only the bandwidth of a single link is available until the failure is resolved. 
This configuration has the following characteristics: 
– Two inter-site links and two remote copy port groups are configured. 
– Each node has only one IP port in remote copy port group 1 or 2. 
– Both the IP ports in the two remote copy po rt groups participate simultaneously in IP 
partnerships. Therefore, both of the links are used.
– During node failure or link failure, the IP partnership traffic continues from the other 
available link and the port group. Therefore, if two links of 10 Mbps each are available 
and you have 20 Mbps of effective link bandwidth, bandwidth is reduced to 10 Mbps 
only during a failure. 
– After the node failure or link failure is resolved and failback happens, the entire 
bandwidth of both of the links is available as before.