VxRail supports a solution specifically for small-scale deployments with reduced workload and availability requirements, such as those in a remote office setting. The solution is fixed to two VxRail nodes only, and like the stretched-cluster solution, requires a third site to act as a witness for monitoring purposes.
If you plan to deploy 2-node VxRail clusters, note the following:
- 2x1G and 2x10G
- All four network ports connect to the top-of-rack switch
- A pair of network cables connect to create two links between the physical nodes, and the other two network ports connect to the top-of-rack switch
- An ESXi instance is required at the Witness site.
- There is a 1:1 ratio of Witness per 2-Node cluster.
- Witness can be deployed at the same site as the data nodes but not on the 2-Node cluster.
- For instances where there are more than one 2-Node clusters deployed at the site, the Witness can reside on a 2-Node cluster it is not monitoring. This configuration requires a VMware RPQ.
- The top-of-rack switch must be able to connect over the network with the Witness site.
Figure 12 2-Node Cluster
Topology with direct connections between nodes
Like the vSAN stretched-cluster feature, the small-scale solution has strict networking guidelines, specifically for the WAN, that must be adhered to for the solution to work. For more information about the planning and preparation for a deployment of a 2-node VxRail cluster, go to Dell EMC vSAN 2-Node Cluster Planning and Preparation Guide.