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STATUS_VOLMGR_PLEX_NOT_SIMPLE
The command is defined only for a simple plex
STATUS_VOLMGR_PLEX_NOT_SIMPLE means the selected plex is not simple even though the requested operation requires a simple layout. The failure is about volume geometry, not disk health.
A simple dynamic volume uses extents from one disk, while spanned and striped layouts distribute the logical volume differently and mirrored/parity layouts add redundancy semantics. An operation that assumes one simple plex cannot safely infer how to modify those other layouts.
Check the plex type returned by the provider and review how the management tool selected the operation. If a volume was extended, converted, or recreated, an old assumption that it is simple may no longer match the current topology.
What to inspect
- Query current volume and plex type before calling the simple-plex-specific operation.
- Inspect whether the volume is spanned, striped, mirrored, or parity-based rather than inferring type from drive-letter use.
- Choose the API path documented for the actual layout instead of coercing the plex into a simple-volume workflow.
References
- Microsoft VOLMGR table for STATUS_VOLMGR_PLEX_NOT_SIMPLE.
- Microsoft VDS comparison of simple, spanned, striped, mirrored, and parity volumes.
- Microsoft dynamic-disk operations and supported volume layouts.
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