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ERROR_SPACES_DRIVE_REDUNDANCY_INVALID
PhysicalDiskRedundancy specifies tolerated disk failures
ERROR_SPACES_DRIVE_REDUNDANCY_INVALID means the requested failure tolerance cannot be realized by the selected resiliency setting and topology. PhysicalDiskRedundancy is a layout requirement: it is not the count of spare disks and it is not necessarily identical to the number of data copies.
For example, mirror and parity layouts derive protection differently. The provider must map the requested redundancy to copies or parity fragments across enough independent disks and fault domains.
Resolve the geometry rather than lowering protection blindly
- Confirm whether the intended layout is Mirror, Parity, or a tiered combination.
- Enumerate the supported minimum and maximum redundancy for that resiliency setting.
- Count eligible disks in distinct fault domains, not merely attached devices.
- Check whether explicit data-copy and parity settings conflict with redundancy.
- Verify that retired, unhealthy, or journal-only disks are not counted as usable capacity.
- Use automatic layout selection when no tested geometry requirement exists.
References
- Microsoft: CreateVirtualDisk parameters
- Microsoft: fault tolerance and storage efficiency
- Microsoft: New-VirtualDisk
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