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Date: Sun, 16 Jul 2006 15:57:45 -0700 From: "Jonathan Baccash" <jbaccash@...il.com> To: "Chuck Ebbert" <76306.1226@...puserve.com> Cc: linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: raid io requests not parallel? > Because a single read not only goes to just one disk, it is sent to > the disk with the lowest expected seek time for that request. This > cuts average read time in half, on average. > > (See drivers/md/raid1.c::read_balance().) Thanks Chuck! That is making some sense, although I think I'll have to read and think about it some more before I quite understand. > You didn't post any benchmarks showing results for single write to a > single disk. I didn't think I could get any repeatable results for a single write, so I was trying to understand what is happening based on runs of longer writes. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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