mysqlが立たない

120808 18:06:29 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
120808 18:09:17 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
120808 18:09:17  InnoDB: Initializing buffer pool, size = 2.0G
120808 18:09:17  InnoDB: Completed initialization of buffer pool
InnoDB: Error: auto-extending data file ./ibdata1 is of a different size
InnoDB: 640 pages (rounded down to MB) than specified in the .cnf file:
InnoDB: initial 65536 pages, max 0 (relevant if non-zero) pages!
InnoDB: Could not open or create data files.
InnoDB: If you tried to add new data files, and it failed here,
InnoDB: you should now edit innodb_data_file_path in my.cnf back
InnoDB: to what it was, and remove the new ibdata files InnoDB created
InnoDB: in this failed attempt. InnoDB only wrote those files full of
InnoDB: zeros, but did not yet use them in any way. But be careful: do not
InnoDB: remove old data files which contain your precious data!
120808 18:09:17 [ERROR] Plugin 'InnoDB' init function returned error.
120808 18:09:17 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
120808 18:09:17 [ERROR] Unknown/unsupported table type: innodb
120808 18:09:17 [ERROR] Aborting

120808 18:09:17 [Note] /usr/libexec/mysqld: Shutdown complete