OpenVZ VE's private and root directories must be on the same device

Files in a VE are stored under /var/lib/vz/private/${veid}. There is also /var/lib/vz/root/${veid} which is empty if the VZ is not alive and populated with what the VE sees when it is alive.

If you are moving the VE storage to another device, make sure to move both the private and root directories.

mount /mnt/newlocation
ln -s /mnt/newlocation/private/999 /var/lib/vz/private/999
ln -s /mnt/newlocation/root/999 /var/lib/vz/root/999

Otherwise you'll be getting this erronous error message:

> vzctl start 999
Starting VPS ...
vzquota : (error) Quota on syscall for 999: Device or resource busy
vzquota on failed [3]