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VDS_E_EXTEND_MULTIPLE_DISKS_NOT_SUPPORTED
VDS_E_EXTEND_MULTIPLE_DISKS_NOT_SUPPORTED means the requested extension would add extents from more than one disk, but the provider or current volume layout does not support that operation. Extend requests are expressed as explicit disk extents, not merely a target size.
Plan the extension against provider and layout capability
- Query free extents on candidate disks.
- Read the current volume type and provider before constructing the extent array.
- Use a single supported disk or redesign the volume rather than retrying the same multi-disk request.
A large amount of aggregate free space does not prove the provider can span it. Simple/basic volumes and third-party providers can impose different rules. Preserve the exact extent list in diagnostics, because the error is about placement across disks rather than filesystem free space inside the volume.
Extend · QueryExtents · Volume types
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