From: Luca Berra <bluca@comedia.it>
To: linux-raid@vger.kernel.org
Subject: Re: MD RAID1 performance very different from non-RAID partition
Date: Tue, 18 Sep 2007 15:44:38 +0200 [thread overview]
Message-ID: <20070918134438.GA1522@percy.comedia.it> (raw)
In-Reply-To: <46EEA413.8090706@quo.to>
On Mon, Sep 17, 2007 at 10:58:11AM -0500, Jordan Russell wrote:
>Goswin von Brederlow wrote:
>> Jordan Russell <jr-list-2007@quo.to> 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.
--
Luca Berra -- bluca@comedia.it
Communication Media & Services S.r.l.
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next prev parent reply other threads:[~2007-09-18 13:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-15 5:28 MD RAID1 performance very different from non-RAID partition Jordan Russell
2007-09-15 7:09 ` Iustin Pop
2007-09-15 12:18 ` Goswin von Brederlow
2007-09-15 12:32 ` Iustin Pop
2007-09-15 18:11 ` Jordan Russell
2007-09-16 22:08 ` Goswin von Brederlow
2007-09-17 15:58 ` Jordan Russell
2007-09-18 13:44 ` Luca Berra [this message]
2007-09-19 5:28 ` Jordan Russell
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