RHEL 7 I/O scheduler policy change.

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The I/O scheduler policy has changed with Red Hat Enterprise Linux 7.

The default I/O Scheduler is now CFQ for SATA drives and Deadline for everything else.
Indeed, for faster storage than SATA drives, Deadline outperforms CFQ, giving a performance increase without any special tuning.

Additional information and instructions are available in the I/O scheduler tutorial.

Posted in RHEL7

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Allowed time: 10 minutes.
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