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ERROR_VOLMGR_PLEX_IN_SYNC
Interpret the state transition: volmgr plex in sync
Windows returns ERROR_VOLMGR_PLEX_IN_SYNC, value 0xC0380038, at the volmgr boundary. It means that the selected volume plex already represents the same committed data as the other active plexes. Preserve the exact handle and generation of volume plex descriptor, layout type and regeneration state before any rescan changes the evidence.
Dynamic volumes are represented as packs containing disks and volumes; each volume has one or more plexes, and each plex is assembled from members and extents. Indices and counts are relative to the submitted layout generation, while configuration logs are replicated across participating dynamic disks. This object model determines which identifiers, counts and ownership state are meaningful while diagnosing this result.
The standard message identifies the immediate condition, but this result also requires the producer API, object topology and attempted state transition. Capture them before an automatic refresh advances the storage generation.
Record geometry, identity and ownership
| Storage diagnostic field | Value |
|---|---|
| Closest comparison | ERROR_VOLMGR_PLEX_REGENERATING |
| Owning object | volume plex descriptor, layout type and regeneration state |
| Rejected invariant | the selected volume plex already represents the same committed data as the other active plexes |
| Identity and generation | volume ID, plex ordinal, plex type, member array, active/inactive state, health status and current regeneration job |
| Narrow experiment | query health and synchronization state before requesting regeneration, then compare with a deliberately stale test member or plex |
Do not overwrite this result with a close, detach or rollback error. Preserve the causal order so the original storage contract remains visible.
Separate validation from capability
- serialize the failing request and the enumeration from which its identifiers came while diagnosing this result.
- Preserve volume ID, plex ordinal, plex type, member array, active/inactive state, health status and current regeneration job while every handle is still valid.
- Repeat the operation using this controlled change: query health and synchronization state before requesting regeneration, then compare with a deliberately stale test member or plex.
- Close and reacquire the relevant objects, then run once more to test lifecycle correctness after it.
A useful diagnostic fork is ERROR_VOLMGR_PLEX_REGENERATING versus it. This code concerns the selected volume plex already represents the same committed data as the other active plexes; the alternate code should remain observable after the fix, proving the application did not suppress the entire subsystem.
Mechanism-specific note
This is an idempotency boundary. The object is healthy enough that another regeneration request would add work without changing redundancy. Verify the reported synchronization generation and health of the other copies; if data is still suspected, investigate checksums or the actual stale object rather than forcing a rebuild of the already synchronized one.
Verification after correction
Treat the result as state feedback and skip regeneration for that object; refresh health information before deciding whether another member or plex needs repair. Keep the correction scoped to the owning object and avoid rewriting adjacent metadata merely to make the call return success.
- The controlled A/B case changes only the invariant responsible for it.
- No unrelated disk, cluster owner, tier policy or virtual-disk backing file is altered to hide it.
- Health, synchronization or job state reaches a terminal value consistent with the repaired the operation.
- Telemetry includes both symbolic names when it or
ERROR_VOLMGR_PLEX_REGENERATINGoccurs again.
Do not use it as a reason to edit dynamic-disk sectors, VHDX metadata, RCT sidecars or snapshot support files directly for it. Unsupported edits can turn a recoverable state mismatch into persistent corruption for it.
Technical references
- Microsoft: COM error codes for VOLMGR, VHD and SDIAG — primary API or object-model reference for the boundary.
- Microsoft: Virtual Disk Service object model — use this source to verify volmgr state and parameters for it.
- Microsoft: Pack object — documents the supported management path relevant to it.
- Microsoft: Virtual Disk Service common return codes — defines the volmgr objects used to interpret it.
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