mkdir: cannot create directory 'test': Disk quota exceeded
You are out of inodes usually:
df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/simfs 200000 200000 0 100% /
none ........
Openvz problem, it is confusing because it's an inode issue and there is enough free space.
cp: cannot create regular file `forums/memberlist.php': Disk quota exceeded
/dev/simfs 60G 20G 41G 33% /
none 2.0G 4.0K 2.0G 1% /dev........
Initializing quota ...
Error: Not enough parameters, diskinodes quota not set
vzctl set $veid --diskinodes 90000:91000 --save
New versions of OpenVZ seem to have some strange diskinodes parameter which is required.........