mysql innodb配置问题

my.cnf配置如下

# Uncomment the following if you are using InnoDB tables

innodb_data_home_dir = /var/lib/mysql

innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend

innodb_log_group_home_dir = /var/lib/mysql

innodb_log_files_in_group = 3

# You can set .._buffer_pool_size up to 50 - 80 %

# of RAM but beware of setting memory usage too high

innodb_buffer_pool_size = 1500M

innodb_additional_mem_pool_size = 20M

# Set .._log_file_size to 25 % of buffer pool size

innodb_log_file_size = 360M

innodb_log_buffer_size = 16M

innodb_flush_log_at_trx_commit = 2

innodb_lock_wait_timeout = 150

innodb_open_files = 600

innodb_max_dirty_pages_pct = 50

innodb_file_per_table = 1

innodb_flush_method=O_DIRECT

innodb_file_io_threads=4

这些配置完成后my.cnf的配置就结束了
但是重启的时候提示无法重启，这个时候要看日志文件 localhost.localdomain.err

130605 18:48:10 mysqld_safe mysqld from pid file /var/lib/mysql/localhost.localdomain.pid ended

130605 18:48:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

130605 18:48:11 InnoDB: The InnoDB memory heap is disabled

130605 18:48:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins

130605 18:48:11 InnoDB: Compressed tables use zlib 1.2.3

130605 18:48:11 InnoDB: Initializing buffer pool, size = 1.5G

130605 18:48:11 InnoDB: Completed initialization of buffer pool

InnoDB: Error: data file /var/lib/mysql/ibdata1 is of a different size

InnoDB: 128000 pages (rounded down to MB)

InnoDB: than specified in the .cnf file 12800 pages!

130605 18:48:11 InnoDB: Could not open or create data files.

130605 18:48:11 InnoDB: If you tried to add new data files, and it failed here,

130605 18:48:11 InnoDB: you should now edit innodb_data_file_path in my.cnf back

130605 18:48:11 InnoDB: to what it was, and remove the new ibdata files InnoDB created

130605 18:48:11 InnoDB: in this failed attempt. InnoDB only wrote those files full of

130605 18:48:11 InnoDB: zeros, but did not yet use them in any way. But be careful: do not

130605 18:48:11 InnoDB: remove old data files which contain your precious data!

130605 18:48:11 [ERROR] Plugin 'InnoDB' init function returned error.

130605 18:48:11 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

130605 18:48:11 [ERROR] Unknown/unsupported storage engine: InnoDB

130605 18:48:11 [ERROR] Aborting

130605 18:48:11 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete

130605 18:48:11 mysqld_safe mysqld from pid file /var/lib/mysql/localhost.localdomain.pid ended

从日志文件可以看出 InnoDB: Error: data file /var/lib/mysql/ibdata1 is of a different size  
ibdata1 这个文件和my.cnf----innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend 中的2000M 不一样
这个时候我们要把 ibdata1备份或者删除掉
然后重启mysql就OK了。