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I am studying about Disk Scheduling in my OS class. Thought about the disk scheduler in Linux. When I run

cat /sys/block/sda/queue/scheduler 
noop anticipatory deadline [cfq] 

Someone explain about this noop anticipatory deadline [cfq]. Text books says scan, cscan, look, fifo, sstf...

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up vote 5 down vote accepted

That means that four schedulers are available, noop, anticipatory, deadline, and cfq. Currently, cfq is active. See Selecting a Linux I/O Scheduler.

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