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STATUS_SPACES_NOT_ENOUGH_DRIVES
This is a layout-capacity error, not necessarily a free-space error
Storage Spaces needs enough eligible physical disks to place the requested stripes and resiliency information. A pool can have unused bytes and still fail this check when there are too few usable disks, when the necessary fault domains are absent, or when candidate disks are not in an operational state that permits allocation.
What to count
- Count healthy, allocatable disks in the selected pool, not every disk shown by the operating system.
- Include the requested mirror or parity redundancy, column count, and any enclosure or server fault-domain requirements.
- For an existing degraded pool, identify failed or retired members before adding capacity; simply adding a disk may not make an unsuitable layout safe.
Microsoft: CreateVirtualDisk error conditions
Microsoft: fault tolerance requirements
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