RAID 50 Offline Although Every Drive Looks Healthy
Every physical drive may respond while the RAID 50 virtual disk remains offline. Healthy status confirms communication with a device; it does not prove that the lower RAID 5 groups or the stripe across them match the original array.
Do not force the array online, clear configuration, or recreate it from remembered settings. Record the complete controller view and member order first.
What this condition means
The controller may be rejecting group membership, configuration metadata, a lower-group reconstruction, or the top-level stripe even though it can communicate with every drive.
Power, firmware, cache, backplane, controller replacement, or earlier recovery actions can change how the array is presented without erasing every member.
What to record
- Controller, enclosure, firmware, and expected capacity
- Physical-drive, lower-group, and virtual-disk status screens
- Bay, serial number, and size of every drive
- The last successful mount and first offline event
- Power events, updates, imports, replacements, rebuilds, and repairs
What not to do
- Force the virtual disk or members online
- Clear and import configuration by trial and error
- Create a replacement RAID 50 over the members
- Move drives between bays while testing
- Run filesystem repair on an unverified layout
How ADR evaluates it
ADR compares the controller report with the identity, metadata, and readability of each member, then reconstructs the RAID 5 groups separately.
The upper stripe, expected capacity, filesystem, and priority files are checked before recovered data is written to separate destination storage.
What happens next
An offline virtual disk does not mean every member failed. ADR can begin from protected member access without forcing the production controller to bring the RAID 50 online.