Formerly, the combined size of the InnoDB redo log files was limited to 4 gigabytes. Starting in MySQL 5.6.3, this size limit is raised to 512GB.

You do not need any special upgrade process or file format to take advantage of this feature. The bytes that record the extra size information were already reserved and set to zero in the InnoDB system tablespace.

If you develop applications that interact with the InnoDB logical sequence number (LSN) value, change your code to use guaranteed 64-bit variables to store and compare LSN values, rather than 32-bit variables.