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STATUS_VOLMGR_NUMBER_OF_MEMBERS_INVALID
The member count is inconsistent with the requested volume topology
STATUS_VOLMGR_NUMBER_OF_MEMBERS_INVALID rejects the number of volume members described by the request. It is a topology-validation status and does not by itself indicate that any member is missing from the machine.
The meaning of a member depends on the fault-tolerant layout: Microsoft protocol documentation treats a mirrored-volume plex and a RAID-5 column/member differently. The expected count therefore has to be interpreted with the volume and plex type, not as a universal constant.
Compare the declared member count with the actual member array and the intended operation. A request generated from stale topology can still contain valid member IDs individually while its count no longer matches the current plex organization.
What to inspect
- Validate the count and member array length together before submitting the layout.
- Record the associated plex type because member semantics differ for mirror and parity configurations.
- Re-enumerate after regeneration, detach, or import events that can change the topology seen by management software.
References
- Microsoft VOLMGR definition of STATUS_VOLMGR_NUMBER_OF_MEMBERS_INVALID.
- MS-DMRP explanation of volume members.
- Microsoft VDS volume and plex object model.
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