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 32768 151 32617 1% /dev
none 32768 1 32767 1% /dev/shm
If this is an OpenVZ, you can increase the inodes, if it's not you need to run filesystem tools to increase the available inodes.
Check Indoes on filesystem:
tune2fs -l /dev/md0|grep -i inodes
Free inodes: 32575578
Inodes per group: 8192
eg. in OpenVZ set the inodes to 50 million:
vzctl set 30777 --diskinodes 50000000:50000000 --save
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