Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Installation Guide Page 166

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Glossary
154
available at mkfs time as well. Doing well-aligned allocation I/O can
avoid inefficient read-modify-write cycles on the underlying storage.
Write Barriers A method to enforce consistent I/O ordering on storage devices which
have volatile write caches. Barriers must be used to ensure that
after a power loss, the ordering guarantees required by metadata
journalling are not violated due to the storage hardware writing
out blocks from its volatile write cache in a different order than the
operating system requested.
See Also Metadata Journaling.
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