vzctl is fauting to create container with the following error

Creating container private area (....)
tar: ./boot: Cannot mkdir: Disk quota exceeded
...
vps-create ERROR: Error in tar -z -xf /vz/template/cache/....tar.gz
Creation of container private area failed

if not ARCHITECTURE version of vzquota is installed, i.e. you have vzquota.i386 installed over x86_64 running linux(kernel). additionally install vzquota for your arch, will be enought to simply do 'yum install vzquota' . Hope this helps.