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STATUS_FREE_SPACE_TOO_FRAGMENTED
Free capacity exists, but not in a usable layout
This status distinguishes total free space from allocatable free space. An operation may require a sufficiently large, contiguous, aligned, or tier-specific extent even though the volume reports enough free bytes in aggregate.
Determine the allocation constraints of the failed operation before running generic defragmentation. Storage Spaces slab consolidation, tier optimization, and file-system defragmentation solve different layout problems. On a heavily allocated volume, freeing additional capacity may be necessary before any optimizer can assemble a suitable extent.
What to inspect
- Record requested size, alignment, tier, and allocation-unit requirements.
- Analyze the volume before choosing defrag, slab consolidation, or tier optimization.
- Create safety margin by freeing or adding capacity.
References
- Microsoft: Optimize-Volume
- Microsoft: Plan Storage Spaces volumes
- Microsoft Open Specifications: NTSTATUS values
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