Red Hat Bugzilla – Bug 160319
Enable O_DIRECT in dd
Last modified: 2012-06-20 11:54:43 EDT
Description of problem:
Raw devices are deprecated. The recommended way of achieving the same
functionality is to open a regular block device with O_DIRECT.
But customers cannot completely migrate to O_DIRECT as long as certain core
tools, often used on raw devices, do not support O_DIRECT. In particular, dd is
often used to copy/backup raw device contents; it needs to support O_DIRECT to
enable this migration.
The severity of lacking O_DIRECT is mitigated by the fact that buffered IO
_does_ still work; it's just less efficient, both in terms of CPU utilisation
and the load it places on the VM.
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