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Does ionice work in Software-RAID environments? I cannot set the CFQ scheduler for the md devices, because there is no file /sys/block/md0/queue/scheduler . It seems that the scheduler settings for the underlying disks are not propagated to the raid devices.

Ideas?

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Chris Siebenmann recently came to the same conclusion as you: ionice has no effect on either "software raid" (I presume this means MD) or LVM.

http://utcc.utoronto.ca/~cks/space/blog/

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