What does HRESULT 0xC0380051 (ERROR_VOLMGR_PACK_CONFIG_ONLINE) mean?

ERROR_VOLMGR_PACK_CONFIG_ONLINE

Identify the owner before touching the layout: volmgr pack config online

ERROR_VOLMGR_PACK_CONFIG_ONLINE (0xC0380051) is emitted by the volmgr path when the request expects an offline pack configuration, but the disk group is currently active and online. The deciding object for it is dynamic-disk pack identity, quorum and replicated configuration log, so the first investigation belongs there rather than in a generic “disk failure” bucket.

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.

The standard message identifies the immediate condition, but this result also requires the producer API, object topology and attempted state transition for it. Capture them before an automatic refresh advances the storage generation.

Minimum diagnostic set

A management layer handling this result should report later recovery errors separately, because they answer a different question from the failed storage operation.

Reproduce without destructive cleanup

1. Associate this result with one caller, one transaction and one target UniqueId.
2. Save the pre-call and post-call inventories, including pack GUID and name, online state, primary flag, disk inventory, configuration-log sequence numbers, quorum view and failing transaction ID.
3. Use this A/B case for it without touching unrelated storage: query the pack configuration state, perform one controlled online/offline transition, and repeat the identical metadata operation.
4. Validate both the HRESULT and the on-disk or provider state after the relevant reopen, remount or attach cycle for it.

Use ERROR_VOLMGR_PACK_CONFIG_OFFLINE as the nearest comparison. This result is specific to the request expects an offline pack configuration, but the disk group is currently active and online; 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

Pack configuration state controls which metadata transitions are legal; it is not the same as one disk being offline in Disk Management while diagnosing it. Capture the pack state and the state of each disk separately, then perform one explicit state transition and refresh the pack object before retrying for it.

Restore the contract

Repair the pack configuration through supported dynamic-disk management, preserving GUIDs and the newest valid log sequence; avoid sector-level edits to replicated metadata. Apply the change through the supported storage API, then close and reacquire affected objects before retrying for it.

• the first retry uses newly enumerated identifiers rather than cached handles.
• 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_PACK_CONFIG_OFFLINE path remains separately testable and separately logged.

A reboot, blanket disk conversion or deletion of storage metadata is not a justified first response to it; it changes multiple invariants and can erase the evidence needed to identify the defect for it.

Technical references

• Microsoft: COM error codes for VOLMGR, VHD and SDIAG — defines the volmgr objects used to interpret it.
• Microsoft: Virtual Disk Service object model — primary API or object-model reference for the boundary.
• Microsoft: Pack object — use this source to verify volmgr state and parameters for it.
• Microsoft: Virtual Disk Service common return codes — documents the supported management path relevant to it.

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