MySql error: Can't start server: can't create PID file: No space left on device

Today, MySQL server didn't start in the morning.
 I checked log file of the server and found the following message:
121203 13:31:12 [ERROR] Can't start server: can't create PID file: No space left on device
121203 13:31:12 mysqld_safe Number of processes running now: 1
121203 13:31:12 mysqld_safe mysqld process hanging, pid 1708 - killed
121203 13:31:12 mysqld_safe mysqld restarted
121203 13:31:12 [Warning] '--default-character-set' is deprecated and will be removed in a future release. Please use '--character-set-server' instead.

I examined the usage of HDDs of the host.
$ df -h
Filesystem                                         Size   Used Avail Use%   Mounted on
/dev/mapper/vg_cloud-lv_root   953G 914G      0 100%  /
tmpfs                                               3.3G 308K  3.3G      1%  /dev/shm
/dev/sda1                                        485M 67M   393M    15%  /boot
/dev/mapper/vg_cloud-lv_home         872G 249M  827G     1%  /home
xenstore                                          3.8G 104K   3.8G     1%. /var/lib/xenstored

The reason was that I created a big sized virtual hard disk for my testing environment and it caused insufficient disk size. Now, I deleted this VHD and I will move to big sizes files to /dev/mapper/vg_cloud-lv_home to make enough space on root directory soon.

References
1. http://hackerstv.blogspot.kr/2011/11/solved-mysql-cant-start-server-cant.html

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