From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen Subject: Re: Benchmarks: Linux Kernel RAID vs a Hardware RAID setup Date: Wed, 23 Jul 2008 09:45:39 +0200 Message-ID: <20080723074539.GA13549@rap.rap.dk> References: <1216130769.5633.318.camel@sam.localdomain> <20080715163932.GA23164@rap.rap.dk> <487CEF1A.6050402@wasp.net.au> <20080715201221.GB26439@rap.rap.dk> <4884BF7B.6030206@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <4884BF7B.6030206@tmr.com> Sender: linux-raid-owner@vger.kernel.org To: Bill Davidsen Cc: Brad Campbell , Ben Martin , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Mon, Jul 21, 2008 at 12:55:23PM -0400, Bill Davidsen wrote: > Keld J=F8rn Simonsen wrote: > >On Tue, Jul 15, 2008 at 10:40:26PM +0400, Brad Campbell wrote: > > =20 > >>Keld J=F8rn Simonsen wrote: > >> > >> =20 > >>>I would also welcome test with mobo HW RAID - Many mobo's today co= me > >>>with some HW raid functionality, and many people would be in the > >>>situation of whether to choose a HW or SW configuration. > >>> =20 > >>Do you have some pointers for information on motherboards that come= with=20 > >>hardware raid? I'd be interested to have a look at them. I've certa= inly=20 > >>seen plenty of "fakeraid" systems, but I've not yet come across har= dware=20 > >>raid on an MB. > >> =20 > > > >It is possible that I am thinking of what you call fakeraid. > > =20 >=20 > I like "firmware raid" better, but the bottom line here is that the r= aid=20 > is still done in the system CPU. These often have little or no hardwa= re=20 > support, such as cache so that multiple drives can be written without= =20 > passing the data through the system bus more than once (and chancing=20 > change while that happens). OK, if the definition on these controllers is that they must have suppo= rt from the OS, then I think most of the mobos today come with hardware raid, that is there needs to be no support in Linux for this. Everythin= g is set up via the bios, and from the linux kernel it looks like an ordinary disk. Best regards keld -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html