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VDS_E_VOLUME_NOT_ONLINE
VDS_E_VOLUME_NOT_ONLINE is a volume-state error. It should not be confused with VDS_E_DISK_NOT_ONLINE, which refers to one or more specified disks, or with an offline pack that makes all of its volumes inaccessible.
Determine why this volume is offline
VDS_VOLUME_PROP reports volume status separately from health and transition state. Microsoft also documents that an offline volume has the VDS_VF_PERMANENTLY_DISMOUNTED flag and VDS_VS_OFFLINE status. Those properties distinguish a deliberate permanent dismount from a transient assumption that the drive letter merely disappeared.
What to verify
- Query the volume properties and retain status, health, transition state, flags, and volume type.
- Check the containing pack and member disks because a pack-level or disk-level failure can affect the visible volume state.
- Bring the volume online only when the storage ownership and reason for its offline state are understood.
References
- Microsoft: VDS_E_VOLUME_NOT_ONLINE
- Microsoft: VDS_VOLUME_PROP offline semantics
- Microsoft: VDS_VOLUME_STATUS
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