Synology SHR recovery
Synology Hybrid RAID can combine Linux md RAID layers, LVM, filesystems, SSD cache, and encryption. A Crashed state may follow excessive drive failures, unreadable sectors, enclosure problems, interrupted repair, or incorrect migration.
Understand the symptom
Synology distinguishes Degraded pools that may be repairable from Crashed pools requiring troubleshooting. SHR layouts can include different-size disks and multiple RAID components. Replacing, assembling, or repairing the wrong disk can change md metadata and LVM state before the strongest source set is known.
What you may see
DSM cannot provide the volume through the current member set.
The NAS sees metadata but has not mounted the previous pool normally.
Another disk, bad sector, connection, or replacement problem interrupted reconstruction.
Bay order, model compatibility, encryption, or incomplete members may affect assembly.
Protect the source
DSM writes fresh RAID, LVM, and filesystem structures.
A rebuild can stress weak disks and propagate an incorrect source.
Dirty or missing cache devices may contain data not committed to the array.
Do this now
Save Storage Manager screens, logs, md state, SMART details, alerts, and repair history.
Record bay, serial, size, role, failure date, replacements, and SSD cache members.
Keep power supply, backplane, cables, model, DSM version, and encryption keys.
Do not create, remove, repair, scrub, expand, or assemble the source set casually.
NEPFOSYS process
NEPFOSYS maps md components, LVM, filesystems, member history, and cache state.
Readable members are imaged before virtual assembly.
Candidate layers are assembled from images and priority shares are extracted.
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
Not always. SHR can build one or more RAID components based on drive count and sizes, so the exact layout must be read from metadata.
Only after expected members and their health are known. Repair writes across the pool and is unsafe with multiple uncertain disks.
A write-back cache can contain recent data not yet committed to the main pool.
DFW local · Nationwide mail-in