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In some cases
O_DIRECT
value of--innodb-flush-method
can be ignored by InnoDB with a warning. Currently, as of 5.5.29 version, the warning saysIt does not necessarily mean that the data is really located on tmpfs, it is just the most common reason. Another known cause is a combination of
O_DIRECT
value of the option anddata=journal
in the disk configuration.See MDEV-4159 for more details.