From: Mike Fedyk <mfedyk@matchmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Luigi Genoni <kernel@Expansa.sns.it>,
Thunder from the hill <thunder@ngforever.de>,
linux-kernel@vger.kernel.org,
Martin Eriksson <nitrax@giron.wox.org>
Subject: Re: HPT370 RAID-1 or Software RAID-1, what's "best"?
Date: Fri, 15 Mar 2002 17:12:03 -0800 [thread overview]
Message-ID: <20020316011203.GB363@matchmail.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0203151716120.30388-100000@Expansa.sns.it> <E16lvju-0004Bj-00@the-village.bc.nu>
In-Reply-To: <E16lvju-0004Bj-00@the-village.bc.nu>
On Fri, Mar 15, 2002 at 05:43:38PM +0000, Alan Cox wrote:
> > Hardware RAID is indeed better, but what you get using HPT370 IDE
> > controlelr is not hardware raid at all. Just read the code of the driver.
> > You get a software raid, period.
>
> Its not always that simple either.
>
> Software raid on aic7xxx totally blows away the Dell/AMI megaraid card I
> have, to the point the megaraid now resides in my testing bucket. The promise
> Supertrak 100 (now superceded by the SX6000) is also slower than the
> software IDE raid, but does use less CPU in RAID5 mode.
>
> Some hardware raid cards do seem to be winners. The Dell Perc2/QC aacraid
> based boards (233Mhz ARM etc) really shift. When I've had the chance to
> borrow the disks to test I've seen it running over 100Mbytes/second. It
> also supports nice stuff like online reconfiguration of active volumes.
> [$$stupid from Dell $$notalot from ebay ;)]
Yep, but the aacraid controllers based on i960 don't do so well. I was able
to double my throughput after switching to software raid (it acts like an
aic7xxx in scsi mode, even using the adaptec driver instead of aacraid).
Mike
next prev parent reply other threads:[~2002-03-16 1:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-15 14:52 HPT370 RAID-1 or Software RAID-1, what's "best"? Thunder from the hill
2002-03-15 15:29 ` Alan Cox
2002-03-15 16:52 ` Luigi Genoni
2002-03-15 17:43 ` Alan Cox
2002-03-15 18:07 ` Luigi Genoni
2002-03-16 1:12 ` Mike Fedyk [this message]
2002-03-18 19:56 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2002-03-14 18:33 Thunder from the hill
2002-03-14 18:53 ` Alan Cox
2002-03-15 9:31 ` Luigi Genoni
2002-03-15 12:59 ` Martin Eriksson
2002-03-15 14:00 ` Ulrich Wiederhold
2002-03-13 21:20 Martin Eriksson
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