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ERROR_VOLMGR_NUMBER_OF_DISKS_IN_PLEX_INVALID
Read the code at the owning storage layer: volmgr number of disks in plex invalid
ERROR_VOLMGR_NUMBER_OF_DISKS_IN_PLEX_INVALID has unsigned value 0xC0380054. In the volmgr layer, it rejects a specific contract because the plex disk count is incompatible with the chosen simple, striped, mirrored or parity organization while diagnosing this result. Diagnosis of it should follow volume plex descriptor, layout type and regeneration state through one controlled state transition.
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 for it.
Keep the first result attached to its request parameters and object generation. Cleanup failures or a later drive-letter change are secondary evidence, not replacements for the original boundary while diagnosing this result.
Build a trustworthy incident record
| Storage diagnostic field | Value |
|---|---|
| Owning object | volume plex descriptor, layout type and regeneration state |
| Rejected invariant | the plex disk count is incompatible with the chosen simple, striped, mirrored or parity organization |
| Identity and generation | volume ID, plex ordinal, plex type, member array, active/inactive state, health status and current regeneration job |
| Narrow experiment | serialize the exact VM_VOLUME_LAYOUT buffer, validate every count and Size field, and compare it with a layout produced by a known-good management API |
| Closest comparison | ERROR_VOLMGR_UNEXPECTED_DISK_LAYOUT_CHANGE |
Do not overwrite this result with a close, detach or rollback error. Preserve the causal order so the original storage contract remains visible.
Controlled comparison
- Before changing state for it, freeze the failing generation and save volume ID, plex ordinal, plex type, member array, active/inactive state, health status and current regeneration job while diagnosing this result.
- Exercise this exact comparison for it: serialize the exact VM_VOLUME_LAYOUT buffer, validate every count and Size field, and compare it with a layout produced by a known-good management API.
- During the result comparison, keep image bytes, unrelated disks, provider policy and cluster topology fixed.
- After the test, record the next return value and the durable object state; crossing the boundary should expose a later result rather than silently retrying.
Use ERROR_VOLMGR_UNEXPECTED_DISK_LAYOUT_CHANGE as the nearest comparison. It is specific to the plex disk count is incompatible with the chosen simple, striped, mirrored or parity organization; the neighboring result belongs to another validation or lifecycle branch. Keeping both names prevents a generic storage label from hiding the actual owner.
Mechanism-specific note
The count field is part of the layout contract rather than an advisory value. Verify it against the number of serialized descriptors and against the minimum geometry required by the selected layout type for it. Check multiplication and addition for overflow before allocating or copying the variable-length buffer, because a correctly sized allocation can still contain a logically impossible count for it.
Completion criteria
Rebuild the layout from enumerated objects and checked arithmetic rather than patching one serialized field; validate counts, indices, sizes, alignment and overflow before submission. Apply the change through the supported storage API, then close and reacquire affected objects before retrying while diagnosing it.
- the first retry uses newly enumerated identifiers rather than cached handles for it.
- The durable metadata or provider state agrees with the success returned after it.
- A second run after close/reopen does not recreate the rejected the condition.
- the nearby
ERROR_VOLMGR_UNEXPECTED_DISK_LAYOUT_CHANGEpath remains separately testable and separately logged.
Avoid broad rescans, forced failovers and metadata deletion until identities and generations are captured. Those actions can make a stale request appear to heal without fixing its caller.
Technical references
- Microsoft: COM error codes for VOLMGR, VHD and SDIAG — documents the supported management path relevant to it.
- Microsoft: Virtual Disk Service object model — defines the volmgr objects used to interpret it.
- Microsoft: Pack object — primary API or object-model reference for the boundary.
- Microsoft: Virtual Disk Service common return codes — use this source to verify volmgr state and parameters for it.
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