[ERROR] Can't start server: can't create PID file: 问题的解决方法

mysql突然无法启动，错误显示创建不了pid。
使用df查看，发现磁盘没空间了。
110525 15:41:46  innodb: Started; log sequence number 0 46409
110525 15:41:46 [ERROR] /usr/local/mysql/libexec/mysqld: Error writing file '/usr/local/mysql/var/apache3.ygy.com.cn.pid' (Errcode: 28)
110525 15:41:46 [ERROR] Can't start server: can't create PID file: No space left on device
110525 15:41:46 mysqld_safe Number of processes running now: 0
110525 15:41:46 mysqld_safe mysqld restarted

原来是创建不了'/usr/local/mysql/var/apache3.ygy.com.cn.pid' No space left on device 没有磁盘空间了。

抓紧释放磁盘空间，问题解决。