Hi, I'm trying to get innodb_use_atomic_writes = 1 working on an ext4 on top of LVM on a ioDrive device with a RHEL6 kernel 2.6.32-358.6.2.el6.x86_64 and getting the following error. Which bit(s) need to change to get it working? 140611 7:43:46 InnoDB: Operating system error number 25 in a file operation. InnoDB: Error number 25 means 'Inappropriate ioctl for device'. InnoDB: Some operating system error numbers are described at InnoDB: http://dev.mysql.com/doc/refman/5.5/en/operating-system-error-codes.html InnoDB: File name ./ibdata1 InnoDB: File operation call: 'ioctl'. InnoDB: Error in opening ./ibdata1 -- -- Daniel Black, Engineer @ Open Query (http://openquery.com.au) Remote expertise & maintenance for MySQL/MariaDB server environments.