From mboxrd@z Thu Jan 1 00:00:00 1970 From: Goswin von Brederlow Subject: Re: LVM and Raid5 Date: Mon, 21 Sep 2009 19:34:05 +0200 Message-ID: <87ljk8rylu.fsf@frosties.localdomain> References: <87ocpb5hft.fsf@frosties.localdomain> <70ed7c3e0909160320j68c792d2g8ba01ac3c34eaae5@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <70ed7c3e0909160320j68c792d2g8ba01ac3c34eaae5@mail.gmail.com> (Majed B.'s message of "Wed, 16 Sep 2009 13:20:40 +0300") Sender: linux-raid-owner@vger.kernel.org To: "Majed B." Cc: Goswin von Brederlow , Linux Raid Study , linux-raid@vger.kernel.org List-Id: linux-raid.ids "Majed B." writes: > Hello, > > I'm the one who ran those tests with LVM vs. RAID5 and I think I have > faced speed difference because I have disks of varying speeds > (different models and vendors), and I believe that LVM gets crippled > down to the speed of the slowest disk. > > On Wed, Sep 16, 2009 at 1:09 PM, Goswin von Brederlow wrote: >> Linux Raid Study writes: >> >>> Hello: >>> >>> Has someone experimented with LVM and Raid5 together (on say, 2.6.2= 7)? >>> Is there any performance drop if LVM/Raid5 are combined vs Raid5 al= one? >>> >>> Thanks for your inputs! >> >> Has always worked perfectly for me and i can't say I noticed any >> performance change. >> >> MfG >> =C2=A0 =C2=A0 =C2=A0 =C2=A0Goswin But the question was raid5 vs lvm+raid5. The raid5 gets cripled down to the slowest disk and speeds up due to striping. The LVM should not have any noticeable effect on top of that. MfG Goswin -- 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