修改配置文件导致ib_logfile大小不匹配，mysql无法启动

#错误原因：在my.cnf文件里面修改了innodb_log_file_size，
#导致ib_logfile文件的大小与之前存在的文件大小不匹配；
#解决方法：在干净关闭数据库的情况下，删除ib_logfile，然后重启数据库


120221 06:47:03 mysqld_safe mysqld from pid file /home/mysql/jsunsa.pid ended
120221 06:47:07 mysqld_safe Starting mysqld daemon with databases from /home/mysql
120221  6:47:07 [Warning] The syntax '--log-slow-queries' is deprecated and will be removed in a future release. Please use '--slow-query-log'/'--slow-query-log-file' instead.
120221  6:47:07 [Note] Plugin 'FEDERATED' is disabled.
120221  6:47:08 InnoDB: The InnoDB memory heap is disabled
120221  6:47:08 InnoDB: Mutexes and rw_locks use InnoDB's own implementation
120221  6:47:08 InnoDB: Compressed tables use zlib 1.2.3
120221  6:47:08 InnoDB: Using Linux native AIO
120221  6:47:08 InnoDB: Initializing buffer pool, size = 16.0M
120221  6:47:08 InnoDB: Completed initialization of buffer pool
InnoDB: Error: log file /home/mysql/ib_logfile0 is of different size 0 5242880 bytes
InnoDB: than specified in the .cnf file 0 134217728 bytes!
120221  6:47:08 [ERROR] Plugin 'InnoDB' init function returned error.
120221  6:47:08 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
120221  6:47:08 [ERROR] Unknown/unsupported storage engine: INNODB
120221  6:47:08 [ERROR] Aborting


120221  6:47:08 [Note] /usr/sbin/mysqld: Shutdown complete