Mysql Error: Unable to lock ./ibdata1, error: 11

Mysql Error:  Unable to lock ./ibdata1, error: 11


If mySQL not start from server command line,, /etc/init.d/mysqld start

that see the log files from another terminal

tail -f /var/log/mysqld.log
IF

Unable to lock ./ibdata1, error: 11


Then....


cd /var/lib/mysql
cp -a ibdata1.bak ibdata1
service mysqld restart

service mysqld restart