Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964958AbWIDR01 (ORCPT ); Mon, 4 Sep 2006 13:26:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964956AbWIDR01 (ORCPT ); Mon, 4 Sep 2006 13:26:27 -0400 Received: from mail.tmr.com ([64.65.253.246]:18837 "EHLO gaimboi.tmr.com") by vger.kernel.org with ESMTP id S964954AbWIDR00 (ORCPT ); Mon, 4 Sep 2006 13:26:26 -0400 Message-ID: <44FC62EF.7040100@tmr.com> Date: Mon, 04 Sep 2006 13:31:27 -0400 From: Bill Davidsen Organization: TMR Associates Inc, Schenectady NY User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.11) Gecko/20050729 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Alan Cox CC: Marc Perkel , Adam Kropelin , Jeff Garzik , Linux Kernel , Linux RAID Mailing List Subject: Re: Linux: Why software RAID? References: <20060824090741.J30362@mail.kroptech.com> <1156425650.3007.140.camel@localhost.localdomain> <44EDB843.2020608@perkel.com> <1156432892.3007.155.camel@localhost.localdomain> In-Reply-To: <1156432892.3007.155.camel@localhost.localdomain> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 953 Lines: 29 Alan Cox wrote: >Ar Iau, 2006-08-24 am 07:31 -0700, ysgrifennodd Marc Perkel: > > >>So - the bottom line answer to my question is that unless you are >>running raid 5 and you have a high powered raid card with cache and >>battery backup that there is no significant speed increase to use >>hardware raid. For raid 0 there is no advantage. >> >> >> >If your raid is entirely on PCI plug in cards and you are doing RAID1 >there is a speed up using hardware assisted raid because of the PCI bus >contention. > I would expect to see this with RAID5 as well, for the same reason... -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/