From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: Benchmarks: Linux Kernel RAID vs a Hardware RAID setup Date: Mon, 21 Jul 2008 12:55:23 -0400 Message-ID: <4884BF7B.6030206@tmr.com> References: <1216130769.5633.318.camel@sam.localdomain> <20080715163932.GA23164@rap.rap.dk> <487CEF1A.6050402@wasp.net.au> <20080715201221.GB26439@rap.rap.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20080715201221.GB26439@rap.rap.dk> Sender: linux-raid-owner@vger.kernel.org To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= Cc: Brad Campbell , Ben Martin , linux-raid@vger.kernel.org List-Id: linux-raid.ids 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 com= e >>> 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 certai= nly=20 >> seen plenty of "fakeraid" systems, but I've not yet come across hard= ware=20 >> raid on an MB. >> =20 > > It is possible that I am thinking of what you call fakeraid. > =20 I like "firmware raid" better, but the bottom line here is that the rai= d=20 is still done in the system CPU. These often have little or no hardware= =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). > Anyway this is what many users buy and look at employing. > And my understanding is that you can set up the mobo controller in th= e > bios, and then have it running with Linux, without further software.=20 > =20 Yes, although the reliability of firmware raid under device failure=20 conditions is dependent on the vendor, firmware level, etc, etc. > I would then like to see what the differences are, and I hope to > document that Linux raid is better... Anyway I am first and foremost > just curious, and if HW/fake raid is faster or better, the I would > gladly recommend it. > =20 Don't confuse HW and firmware raid, they don't have the same failure=20 points and capabilities. --=20 Bill Davidsen "Woe unto the statesman who makes war without a reason that will stil= l be valid when the war is over..." Otto von Bismark=20 -- 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