TerraMaster NAS recovery
TOS can report a pool as degraded when a disk fails and damaged when required members are missing. Mount, array repair, migration and replacement workflows all change pool state, so the right action depends on how many disks failed and what has already been attempted.
Understand the symptom
Recovery maps pool UUIDs, member roles, RAID geometry, synchronization state and the volume or filesystem above the array. A damaged pool may need missing members reintroduced, but unstable disks should be imaged before TOS performs repair or broad reads.
What you may see
TOS cannot find the required set of array members.
One or more disks failed or disconnected within available redundancy.
Member metadata or the filesystem above the array is inconsistent.
A second disk error or interruption left mixed member generations.
Protect the source
A rebuild can overwrite surviving data when failure count or disk identity is uncertain.
TOS warns that creating or deleting storage can remove existing data.
Member order and identity can matter to reconstruction and troubleshooting.
Do this now
Stop repeated repair, mount, scrub and migration attempts.
Record bay, serial, size, status, removed disks and replacement history.
Save pool details, notifications, SMART, logs, RAID type and synchronization state.
Acquire unstable members before TOS rebuild or repair stresses the set.
NEPFOSYS process
NEPFOSYS maps TRAID or RAID metadata, member generations and the volume layer.
The pool is rebuilt virtually from protected member copies.
Recovered folders, permissions and priority files are checked outside the NAS.
A clear next step
Start a case with the exact symptoms, incident timeline, prior attempts, encryption details, and the files that matter most. NEPFOSYS will route the case to the appropriate DFW intake or nationwide mail-in path.
Start with a case reviewQuestions, answered
Required members are missing or the pool cannot assemble with its current disk set.
Only for a well-understood single-disk failure within redundancy; preserve uncertain or unstable sets first.
Possibly, but preserve order, model context, encryption and metadata before any migration or mount attempt.
DFW local · Nationwide mail-in