How can i change var/lib/bz storage , simlink not work

hello,

I've upgrade from pPVE 1.8 to 2.2. The directory /var/lib/vz was pointing previously to a raid 5 partition trough /mnt/WM-PROD mount point , it was made simply by linking symbolikly /var/lib/vz to /mnt/VM-PROD.

I tried to make same and find all my VM and template, iso , etc.. but the link doesn't work, it replies directory busy. I tried to delete the content of /var/lib/vz but it recreate the directories tree automaticly.

None VM are running neither created..

Is there an issue ?

Regards,
Stephane