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Go Back   Linux Archive > Redhat > Device-mapper Development

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Old 03-18-2010, 03:49 PM
Phillip Susi
Default device queue scheduler

I'm wondering why the dm block devices have a request queue at all, and
more importantly why they use the default cfq scheduler. It seems to me
that the physical disk should take care of the scheduling, and not have
that work duplicated at each layer of dm stacked on top. It wonder
though, where should the scheduler policy be set? In libdevmapper, or
by a system udev rule?

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