====== NAS - QNAP - Filesystem not clean ======

The message, **The file system is not clean, please...** notifies the user to do a file system check to make sure of data integrity.

Generally, this happens when the data volume is not unmounted properly, mainly due to:

  * The abnormal shutdown or force power off the NAS.
  * Some services are not stopped properly during the shutdown.
  * Other unexpected cases cause the data volume is not unmounted properly.

<WRAP info>
**NOTE:**  There are two series of NAS, legacy and HAL models and there are some differences in the web GUI of the storage management of where to go to perform this integrity check.

  * Most newer version are HAL.
</WRAP>

----

===== Determine if the NAS is a HAL or legacy model =====

Login to the NAS via SSH.

<code bash>
ls /sbin/hal_app
</code>


If the NAS is a legacy model, the output is:

<code bash>
ls: /sbin/hal_app: No such file or directory
</code>


If the NAS is a HAL model,the output is:

<code bash>
/sbin/hal_app*
</code>


----

===== HAL Models =====

Navigate to **Control Panel -> System Settings -> Storage Management -> Storage Space**.

  * At the right panel, click on the Storage Pool to expand it.
  * Select on the Data Volume and click the **Manage** button.
  * This will popup the Data Volume Management dialog.
  * Click the **Actions** button and select **Check File System** to start the file system check.

  * Once completed, reboot the NAS.
  * Then run the filesystem check again. 


----

===== Legacy Models =====

Navigate to **Control Panel -> System Settings -> Storage Management -> Volume Management**.

  * Click on the **Check File System** button to start the file system check.

  * Once completed, reboot the NAS.
  * Then run the filesystem check again.