How do I replace a failing disk in QNAP?
If your QNAP used a redundant array layer such as RAID5, RAID10 or RAID6, then the drive replacement process will not be difficult.
If you used a non-redundant array type such as RAID0, then if a disk fails, unfortunately, all data is lost forever.
If one of the drives in QNAP is broken, you will most likely see this message:
Replace the failed disk with a new one. Next you will receive the following message:
The array rebuild time depends on the number of disks and the size.
For a rough estimate, we give the following values: for a RAID5, consisting of three 500 GB disks,
it took 2 hours for a complete rebuild.
It is very important that no external factors, such as a power outage, prevent the rebuilding from being completed successfully.
If the rebuild is not completed successfully, then there is a high chance that the metadata will be destroyed and you will
not be able to access the data on QNAP. Therefore, it is very important to have a backup of your data. If you are unlucky,
the rebuild of the array was not successful and you do not have a backup copy,
then the only way to get the data back is to restore it using a special software for data recovery from QNAP devices - ReclaiMe.
Detailed instructions and a video showing the entire process can be
found on the page - How to recover data from QNAP device.
Still have questions?