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STATUS_FT_MISSING_MEMBER
The requested redundant member is not present in the current volume set
STATUS_FT_MISSING_MEMBER is not a generic disk-not-found result. The NTSTATUS text identifies an explicit access to the secondary copy through the fault-tolerance driver, and that secondary member is not present. The distinction matters because the logical volume can still have a known identity while one member of its redundant layout is missing.
Legacy Windows dynamic-disk terminology describes mirrored and RAID-5 volumes as fault-tolerant layouts with redundant data. When a diagnostic or device-control path asks for a particular copy, the presence of the logical volume does not guarantee that the requested member is online and addressable.
Record the volume layout before attempting repair. Reinitializing a disk or creating a new volume on a member that merely lost its path can destroy metadata needed to reattach or recover the set. Identify the disk signature or persistent identifier, controller path and member state first.
What to inspect
- The exact secondary-copy request and the logical fault-tolerant volume it targeted.
- Current member enumeration versus the saved dynamic-disk or volume-management layout.
- Storage, controller and path events showing when the secondary member disappeared.
References
- Microsoft: Basic and Dynamic Disks
- Microsoft Open Specifications: VDS glossary
- Microsoft Open Specifications: Disk Management Remote Protocol glossary
- Microsoft Open Specifications: NTSTATUS values
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