They declare as god faith, If the file system is dirty, we will give you the possibility to do this check.
BUT THIS IS NOT TRUE!
df -h on my NAS reports 97% of busy space.
/dev/md2 2.7T 2.6T 51.1G 98% /i-data/86da92de
du -hd1 on the main volume reports
- Zyxel NAS 326 V5.21(AAZF.2)
- Metarepository + random tools and tweaks package installed
This is the raw command list I used, where you have to replace your actual volume name
The 2nd and 3rd commands remove the volume mount points
The 4th command actually does the file system check reporting it as DIRTY!
Zyxel support is totally inconsistent, they limit their selves to close support tickets they don't like.