Emmanuel Dreyfus <manu%netbsd.org@localhost> writes: > On Tue, May 13, 2014 at 12:10:31PM +0200, Manuel Bouyer wrote: >> At what offset does the partition without RAID start ? > > I think I found something: I have RAID sets that have decent performances. > The goods and the bads are on different control: Try reading from the underlying components of the RAID sets directly. You can do this when the RAID is configured. If that it is fast and the rraidN device is slow, that's one thing, but I haven't so far seen evidence that the issue isn't with the underlying disks.
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