MySQL Error Message
Cannot continue operation. ib_logfiles are too small for
innodb_thread_concurrency %lu. The combined size of ib_logfiles
should be bigger than 200 kB * innodb_thread_concurrency. To get
mysqld to start up, set innodb_thread_concurrency in my.cnf to a
lower value, for example, to 8. After an ERROR-FREE shutdown of
mysqld you can adjust the size of ib_logfiles. %s
Reason for the Error
ER_IB_MSG_668 was added in 8.0.11,
removed after 8.0.13.