To change the number or the size of your
redo log files, perform the
SET GLOBAL innodb_fast_shutdown = 1;
After ensuring that
innodb_fast_shutdownis not set to 2, stop the MySQL server and make sure that it shuts down without errors (to ensure that there is no information for outstanding transactions in the log).
Copy the old log files into a safe place in case something went wrong during the shutdown and you need them to recover the tablespace.
Delete the old log files from the log file directory.
my.cnfto change the log file configuration.