mysql数据库服务无法启动，查看日志报错如下：
2015-01-07 17:48:54 9136 [ERROR] InnoDB: .\ibdata1 can‘t be opened in read-write mode
2015-01-07 17:48:54 9136 [ERROR] InnoDB: The system tablespace must be writable!
2015-01-07 17:48:54 9136 [ERROR] Plugin ‘InnoDB‘ init function returned error.
2015-01-07 17:48:54 9136 [ERROR] Plugin ‘InnoDB‘ registration as a STORAGE ENGINE failed.
2015-01-07 17:48:54 9136 [ERROR] Unknown/unsupported storage engine: InnoDB
2015-01-07 17:48:54 9136 [ERROR] Aborting
解决方法：
1、kill mysql进程；
2、cd /data/mysql
3、重新启动mysql
[ERROR] InnoDB: .\ibdata1 can't be opened in read-write mode
原文：http://aroma.blog.51cto.com/11254807/1754739