[CentOS] Disk Elevator

> Depends is the best answer. It really depends on LVM and the other block
> layer devices. As the io requests descend down the different layers they
> will enter multiple request_queues, each request_queue will have and io
> scheduler assigned to it, either the system default or one of the
> others, or one of the block devices own, so it is hard to say. Only by
> testing can you know for sure. In my tests LVM is very good with
> unnoticeable overhead going to hardware RAID, but if you use MD RAID
> then your experience might be different.
> Hope this helps clarify.

It does, and I should have specified at the outset that this was with
respect to hardware raid.


-- 
During times of universal deceit, telling the truth becomes a revolutionary act.
George Orwell