MySQL Forums :: InnoDB :: Can't change innodb_log_file_size

If you modify the innodb_log_file_size, MySQL will fail to restart and InnoDB will complain about the size of the changed log file.

The proper way to increase the innodb_log_file_size:
- shutdown mysql server
- make backup of log files
- remove InnoDB log files
- set new value for innodb_log_file_size in my.cnf [ you have already done that]
- start mysqld
- check error logs to ensure everything went fine.

Steps to be followed:

- shutdown mysql server e.g. /etc/init.d/mysql stop
- rename innodb log files e.g.
mv /var/lib/mysql/ib_logfile0 /var/lib/mysql/ib_logfile0_bk
mv /var/libmysql/ib_logfile1 /var/lib/mysql/ib_logfile1_bk
- start mysql e.g. /etc/init.d/mysql start

--assuming datadir path is /var/lib/mysql