ACE Peripherals | Support Ticket System

Frequently Asked Question

General: Why does my NAS system log report that the “File system is not clean”?
Last Updated 2 years ago

You will see a “File system is not clean” message if a volume containing data was not properly unmounted. This might happen in the following situations:

  • The NAS experienced an abnormal shutdown or forced power off.
  • Some services were not stopped correctly before a NAS shutdown.

If you see this message, you should check the file system of the volume to repair any possible errors.

Checking the File System of a Volume

For NAS Models Running QTS 4.2 or Later

  1. Log in to QTS.
  2. Go to Storage & Snapshots > Storage > Storage/Snapshots.
  3. Select a volume, and then click Manage.
    The Volume Management window opens.
  4. Select Actions > Check File System.

For NAS Models Running QTS 4.1.x or Earlier

  1. Log in to QTS.
  2. Go to Control Panel > System Settings > Storage Manager > Volume Management.
  3. Click Check File System.

If you still see a “File system is not clean” message after running a file system check, restart the NAS. If this does not resolve the problem, you can contact QNAP technical support by visiting the following link:


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