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I/O Scheduler in Kernel UEKr4 (Doc ID 2180626.1)

Last updated on FEBRUARY 01, 2019

Applies to:

Oracle VM - Version 3.0.1 to 3.4.1 [Release OVM30 to OVM34]
Linux OS - Version Oracle Linux 7.2 with Unbreakable Enterprise Kernel [4.1.12] and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64


Disk I/O schedulers reorder, delay, or merge requests for disk I/O to achieve better throughput and lower latency. Linux has multiple disk I/O schedulers available, including Deadline, Noop, Anticipatory, and Completely Fair Queuing (CFQ).

In Oracle Linux with a UEKr4 kernel however, the scheduler is shown as none,

this document describes why.


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