Container cannot be started with the following error:
[root@vz ~]# vzctl start 101 Mount image: /vz/private/101/root.hdd /dev/ploop30233p1: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) Failed to mount image /vz/private/101/root.hdd: e2fsck failed (exit code 4) Failed to mount image: e2fsck failed (exit code 4) 
Container's mount fails due to file system errors inside the ploop virtual disk.
Run the check disk as per the instructions from the following article
115683 How to perform fsck on a ploop container