Thecus N8800SAS User Manual page 37

To perform a file system check, click Apply.
Once clicked, the following prompt will appear:
Click Yes to reboot the system.
Once the system has rebooted, you will be returned to the File System Check
prompt. There you will see the available RAID volumes to run the file system check
on except ZFS volume, ZFS has no need to perform file system check. Check the
desired RAID volumes and click Next to proceed with the file system check. Click
Reboot to reboot without running the check.
Once you click Next, you will see the following screen:
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