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STATUS_VOLMGR_MEMBER_INDEX_DUPLICATE
Two layout entries claim the same member position
STATUS_VOLMGR_MEMBER_INDEX_DUPLICATE is input-validation failure for a volume layout. More than one entry names the same member index, so Volume Manager cannot build an unambiguous member ordering.
In Microsoft terminology, a volume member can represent a plex in a mirrored volume or a column/member in a RAID-5 volume. The index is therefore part of topology, not a Windows disk number. Reusing a member index can map different extents into one logical position and must be rejected before the layout is applied.
This usually points to a caller or stale-enumeration problem. Compare the requested member array with a fresh topology snapshot and retain both the member index and underlying disk identifiers when tracing the request.
What to inspect
- Find the two input entries that carry the duplicate member index and compare their disk/extents.
- Check whether the layout was assembled after a detach, import, or rebuild changed the member set.
- For custom storage software, validate uniqueness before passing the layout to the Volume Manager interface.
References
- Microsoft VOLMGR definition of STATUS_VOLMGR_MEMBER_INDEX_DUPLICATE.
- MS-DMRP definition of volume members and volume plexes.
- Microsoft VDS hierarchy from a volume to plexes and disk extents.
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