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STATUS_SPACES_WRITE_CACHE_SIZE_INVALID
This is not the Windows file cache
Storage Spaces can expose a write-cache size as a virtual-disk creation parameter. The cache is part of the storage provider's layout and capacity model, not a request to change the Windows filesystem cache. This status means that the explicit size is invalid for the selected pool, media, resiliency setting, or provider capability.
What to do instead of guessing a value
- Confirm whether the provider supports an explicit write-cache size for this type of virtual disk.
- Use automatic sizing or the provider default unless there is a documented performance requirement and compatible hardware.
- Check power-protection and health characteristics of any cache-capable media before treating a cache setting as a throughput-only tuning knob.
Microsoft: CreateVirtualDisk WriteCacheSize
Microsoft: Storage Spaces cache
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