Evaluate nested resiliency for a two-node storage cluster

Source facts

Microsoft limits the documented nested-resiliency configuration to exactly two server nodes and lists supported operating-system versions. The design can keep a volume available through combinations such as a server failure together with a drive failure, beyond classic two-way mirroring. Nested two-way mirroring maintains two copies on different physical disks in each server. Microsoft Learn.

Applicability

Verify the cluster topology and operating-system release against the source before choosing a resiliency option. Identify the exact failure combinations the storage design must address. Include usable capacity and workload performance in the same decision rather than evaluating redundancy alone.

DSE recommendation

Compare the available nested-resiliency choices using the actual drive inventory and a capacity calculation reviewed by the storage owner. Draw where each copy resides and identify which proposed failures remove it. Agree on a controlled lab exercise for the required failure combinations. Document the intended workload behavior and the stop condition before simulating unavailable storage.

Verification

Confirm the created volume layout and measured usable capacity. In an approved test environment, exercise the selected failure combination and observe volume availability together with an application transaction. Record recovery and repair behavior before declaring the exercise complete. Preserve any deviations between the planned copy layout and the observed configuration.

Official references

Microsoft Learn: Nested resiliency for Storage Spaces Direct. Source reviewed September 8, 2026.