User manual

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24.4 Troubleshooting-Abnormal RAID Operation
If the RAID configuration of your NAS is found abnormal or there are error messages, please try the
following solutions:
No te : You must back up the important data on the NAS first to avoid any potential data loss.
1. Check that the RAID rebuilding has failed:
a. LED: The Status LED of NAS flashes in red.
b. On the ‘Disk Management’ > ‘Volume Management’ page, the status of the disk volume
configuration is ‘In degraded mode’.
2. Find out the HDD that causes the RAID rebuilding failure.
You can go to ‘System Administration’ > ‘System Logs’ page to search for the following error
message and find out which HDD causes the error.
Error occurred while accessing Drive X.
Drive X has been removed.
X refers to the number of hard drive slot.
3. Troubleshooting
After plugging in the new HDD (for example, HDD 1), drive rebuilding will start. If the drive
configuration fails again due to read/write error of the HDD in the rebuilding process, identify which
HDD causes the error and follow the steps below to solve the problems.
Situation 1: The error is caused by the newly plugged in HDD.
If the newly plugged in HDD (for example, HDD 1) causes the rebuilding error, please unplug HDD 1
and plug in another new HDD to start RAID rebuilding.
Situation 2: The error is caused by an existing HDD (for example, HDD 2) in the RAID configuration.
If the RAID configuration is RAID 1, you can do either one of the following:
a. Back up the HDD data to another storage device. Then reinstall and set up the NAS.
b. Format the newly plugged in HDD (for example, HDD 1) as a single drive. Then back up the
data on the NAS to this drive (HDD 1) via Web File Manager. Unplug the HDD with errors (for
example, HDD 2). After that, insert a new HDD to NAS to replace the fault drive, and execute
RAID 1 migration.