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• innodb_redo_log_archive_dirs 

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Defines labeled directories where redo log archive files can be created. You can define multiple labeled directories in a semicolon-separated list. For example: 

innodb_redo_log_archive_dirs=’label1:/backups1;label2:/backups2’ 

A label can be any string of characters, with the exception of colons (:), which are not permitted. An empty label is also permitted, but the colon (:) is still required in this case. 

A path must be specified, and the directory must exist. The path can contain colons (’:’), but semicolons (;) are not permitted. 

• innodb_redo_log_encrypt 

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Controls encryption of redo log data for tables encrypted using the InnoDB  data-at-rest encryption feature. Encryption of redo log data is disabled by default. For more information, see Redo Log Encryption. 

• innodb_replication_delay 

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