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VDS_E_MEMBER_MISSING
VDS distinguishes a missing member from an entire missing plex. A striped or RAID-5 plex is composed of multiple members, and a member maps to extents on a contributing disk. Losing one member can make that plex incomplete while the volume-level result depends on its redundancy type and the state of other plexes or parity columns.
Why this state matters
Diagnose at member granularity. Query plex extents and identify the disk that should supply the absent column or member. Check whether the disk is missing from the pack, offline, or returning I/O errors. For mirrored storage, the missing member may belong to only one plex; for parity layouts, the number of unavailable columns determines whether the volume remains recoverable. Avoid replacing the wrong disk based solely on the volume label.
Diagnostic focus
- Query extents for the affected plex and locate the missing member position.
- Identify the contributing disk by VDS object ID and current pack membership.
- Check volume type before judging the effect of a single missing member.
- Repair or replace the failed member only after mapping the exact degraded column.
Technical references
MS-VDS error codes · IVdsVolumePlex · VDS_VOLUME_PLEX_PROP · VDS_VOLUME_STATUS · IVdsPack::CreateVolume
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