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Red Hat Enterprise Linux 4

• CFQ (Complete Fair Queue) Scheduler. Manages I/O requests and bandwidth on a per-process basis; good for workloads requiring low latency and high throughput.

• Deadline scheduler. Gives I/O requests a deadline by which they must be served; best for applications like databases that require frequent disk access.

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• Anticipatory scheduler. Extends the deadline scheduler by adding heuristics that reorder I/O access and increase throughput.

• No-op scheduler. Schedules I/O requests without any algorithmic preference for one request over another; optimal for a virtualized environment that takes advantage of an existing scheduler.

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