It is recommended to use a separate partition for VEs container's private directories (by default /vz/private/<veid>). The reason why you should do so is that if you wish to use OpenVZ per-VE container disk quota, you won't be able to use usual Linux disk quotas on the same partition. Bear in mind, that per-VE container quota in this context includes not only pure per-VE container quota, but also usual Linux disk quota used in VEcontainers, not on [[HN]].

At least try to avoid using the root partition for VEscontainers, because the root user of VE a container will be able to overcome the 5% disk space barrier in some situations. This way the HN root partition can be completely filled and it will break the system.

OpenVZ per-VE container disk quota is supported only for ext2/ext3 filesystems. So use one of these filesystems (ext3 is recommended) if you need per-VE container disk quota.