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VDS_E_INVALID_MEMBER_COUNT
A plex member is not the same as a plex. VDS_VOLUME_PLEX_PROP.ulNumberOfMembers reports the number of members in one plex, and a member can itself be a collection of concatenated extents. Simple and spanned layouts have one member; striped and parity layouts distribute data across multiple members. The member count must therefore match the geometry implied by the plex type.
Why this state matters
When this HRESULT appears, counting physical disks alone can be misleading. One disk may contribute extents to multiple volumes, but VDS does not allow one disk to contribute more than one plex to the same volume. The diagnostic map should show plex ID, member index, and disk ID for each extent so the requested structure can be compared with the existing one.
Diagnostic focus
- Capture
ulNumberOfMembersfor every existing plex and compare it with the requested layout. - Group extents by plex ID and
memberIdx; do not use physical disk count as a substitute for member count. - Validate the plex type before deciding how many members are structurally meaningful.
- For extension requests, remember that all members of all plexes must be extended in the same operation.
Technical references
VDS_VOLUME_PLEX_PROP · VDS_DISK_EXTENT · VDS_INPUT_DISK · VDS_VOLUME_PLEX_TYPE · Volume Object
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