Reading USB in OpenVZ

Hi, I have a server that has installed Proxmox 3.1-21 in several virtual OpenVZ, one of them I want to mount a USB.


This container has installed Centos 6.5, since the amount USB node follows:


mount / dev/sdb1 / mnt / usb /


And then from node also the amount in the container as follows:


mount - bind / mnt / usb / / var/lib/vz/private/100/mnt/usb /


If I make from node df-h


/ dev/sdb1 4.6G 2.7G 63% 7.2g / var/lib/vz/private/100/mnt/usb


Salt mounted drive and doing a ls information see USB, but if I access the virtual SSH when I access the folder / mnt / usb / shows empty.


How I can mount USB in Centos or other container temporarily, do not want this ever assembled, only in specific cases.?


thanks