From: David Rees <dbr@greenhydrant.com>
To: linux-kernel@vger.kernel.org
Subject: Re: SW-RAID0 Performance problems
Date: Sat, 14 Apr 2001 00:04:33 -0700 [thread overview]
Message-ID: <20010414000433.F4557@greenhydrant.com> (raw)
In-Reply-To: <Pine.LNX.4.10.10104131048550.1669-100000@coffee.psychology.mcmaster.ca> <01041317365500.00665@debian> <20010413090751.E4557@greenhydrant.com> <01041318282003.00665@debian>
In-Reply-To: <01041318282003.00665@debian>; from ujq7@rz.uni-karlsruhe.de on Fri, Apr 13, 2001 at 06:28:20PM +0200
On Fri, Apr 13, 2001 at 06:28:20PM +0200, Andreas Peter wrote:
> Am Freitag, 13. April 2001 18:07 schrieb David Rees:
>
> > Cconfig and setup looks OK.
> >
> > What happens if your run hdparm -t /dev/hda and /dev/hdc at the same time?
>
> Good idea!
> The performance is only ~11MB/sec per disk
> There is a bottleneck somewhere...
OK, so it's not the RAID setup. There's two things that can cause this.
One is that DMA is turned off (what does hdparm /dev/hda and hdparm
/dev/hdc show?), the second was that the drives are on the same channel
(which obviously isn't the case here). Can you verify that the drives are
in DMA mode?
-Dave
next prev parent reply other threads:[~2001-04-14 7:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.10.10104131048550.1669-100000@coffee.psychology.mcmaster.ca>
2001-04-13 15:36 ` SW-RAID0 Performance problems Andreas Peter
2001-04-13 16:07 ` David Rees
2001-04-13 16:28 ` Andreas Peter
2001-04-14 7:04 ` David Rees [this message]
2001-04-14 9:38 ` Andreas Peter
2001-04-14 12:28 ` Kurt Roeckx
2001-04-14 13:09 ` Andreas Peter
2001-04-13 18:11 ` Tim Moore
2001-04-14 10:45 ` Andreas Peter
2001-04-13 11:47 Andreas Peter
2001-04-13 16:01 ` Jakob Østergaard
2001-04-13 16:28 ` Andreas Peter
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