Limitations
By default, OpenVZ restricts container access to real physical devices (thus making a container hardware-independent). An OpenVZ administrator can enable container access to various real devices, such as disk drives, USB ports, PCI devices or physical network cards.
/dev/loopN is often restricted in deployments (as loop devices use kernel threads which might be a security issue), which restricts the ability to mount disk images. A work-around is to use FUSE.
OpenVZ is limited to the providing only some VPN technologies based on PPP (such as PPTP/L2TP) and TUN/TAP. IPsec is supported inside containers since kernel 2.6.32.
Read more about this topic: Open VZ
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