Re: MD RAID1 performance very different from non-RAID partition

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On Mon, Sep 17, 2007 at 10:58:11AM -0500, Jordan Russell wrote:
Goswin von Brederlow wrote:
Jordan Russell <jr-list-2007@xxxxxx> writes:
It's an ext3 partition, so I guess that doesn't apply?

I tried remounting /dev/sda2 with the "barrier=0" option (which I assume
disables barriers, looking at the source), though, just to see if it
would make any difference, but it didn't; the database build still took
31 minutes.

Compare the read ahead settings.

I'm not sure what you mean. There's a per-mount read ahead setting?


per device

compare
blockdev --getra /dev/sda2
and blockdev --getra /dev/md0

L.
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