In some cases it is necessary to extend partition with vz folder on Parallels Virtuozzo Containers for Windows.
If it is possible to extend physical drive as seen by host OS, then it is sufficient to extend volume by means of Microsoft Windows OS:
- diskpart command line tool
- Disk Management Snap-in graphical tool
If it is not possible to extend physical drive, the only option is to move containers to the other hard disk drive as per the Knowledge Base article:
1302 [How To] How to change "vz" folder location