[Xymon] Monitoring disk space on OpenVZ container

Hi,

I would like to monitor the disk space on a virtual OpenVZ machine. Unfortunately, these error comes up on the XYmon webpage : "Expected strings (Capacity and Mounted) not found in df output"

On the server : ~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/simfs 26214400 644940 25569460 3% / tmpfs 262144 0 262144 0% /lib/init/rw tmpfs 262144 0 262144 0% /dev/shm

Do you have a way to monitor the / filesystem ?

Thanks