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Why does the NAS540/NAS520/NAS326 RAID volume status show up as “degraded” on the web interface and what should be done?
For the NAS540 and NAS520 and NAS326, refer to the application note of the NAS series as it should contain the steps for repairing volumes in Chapter 3.2:
For other NAS series, when the volume status shows up as “degraded”, follow these steps:
1. Go to Storage > Volume, find the degraded volume.
2. Go to Action > Repair Volume, click the repair volume icon.
3. The NAS will start to rebuild the Raid file system with the hard disk drives.
4. If the volume still cannot be recovered, replace the failed hard disk drive(s) with another or a new one, and do steps 1 to 3 again.
Note: It is recommended to replace the failed hard disk drives with new ones of the same brand and same model.
After a Raid 1, Raid 5, and/or Raid 6 have rebuilt the Raid system, the status will change to “resync”. The user can start putting any file into the NAS.
RAID 10: This Raid type allows two non-adjacent hard disk drives to fail, and the NAS can still rebuild the Raid file system. However, if two adjacent hard disk drives fail, the data cannot be recovered anymore.
Raid 0 or JBOD: Since these are single volume systems, there is no recovery mechanism and therefore, they cannot be repaired. It means the user will lose all data contained in the damaged volume.
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