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To implement nested resiliency in Storage Spaces Direct, a minimum of two cluster nodes is required. Nested resiliency involves leveraging multiple layers of fault tolerance, which is essential in environments where high availability and reliability are paramount.

With two nodes, you can create a mirror, where each node can serve as a failover for the other. This configuration allows for data redundancy, meaning that if one node fails, the other can continue to provide access to the stored data.

Although increasing the number of nodes can enhance fault tolerance, particularly as you move to a three-node or more configuration for additional levels of resiliency (such as a three-way mirror), two nodes are sufficient to establish a basic implementation of nested resiliency.

In summary, while higher numbers of nodes improve performance and resilience, two nodes serve as the foundational level of nested resiliency necessary for basic operations within Storage Spaces Direct.