Stretch MetroCluster configuration on single-enclosure HA pairs
You can configure two stretch MetroCluster configurations between a pair of single-enclosure HA pair systems. In this configuration, the HA pair between the two controllers in each chassis is deactivated, and two separate, side-by-side stretch MetroCluster configurations are formed between the four controllers.
To implement the stretch MetroCluster configuration, you must install an FC-VI adapter in each controller to provide the HA interconnect between the systems. When the FC-VI adapter is installed in the system, the internal InfiniBand interconnect is automatically disabled. This is different from other stretch MetroCluster configurations, which use NVRAM adapters to provide the interconnect.
The following figure shows a stretch MetroCluster configuration on single-enclosure HA pair systems: