From: Jordan Russell <jr-list-2007@quo.to>
To: linux-raid@vger.kernel.org
Subject: Re: MD RAID1 performance very different from non-RAID partition
Date: Sat, 15 Sep 2007 13:11:15 -0500 [thread overview]
Message-ID: <46EC2043.5010006@quo.to> (raw)
In-Reply-To: <20070915070914.GA21515@teal.hq.k1024.org>
Iustin Pop wrote:
> Maybe it's because md doesn't support barriers whereas the disks
> supports them? In this case some filesystems, for example XFS, will work
> faster on raid1 because they can't force the flush to disk using
> barriers.
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.
--
Jordan Russell
next prev parent reply other threads:[~2007-09-15 18:11 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 [this message]
2007-09-16 22:08 ` Goswin von Brederlow
2007-09-17 15:58 ` Jordan Russell
2007-09-18 13:44 ` Luca Berra
2007-09-19 5:28 ` Jordan Russell
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