Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 5 Oct 2001 14:22:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 5 Oct 2001 14:22:23 -0400 Received: from ntt-connection.daiwausa.com ([210.175.188.3]:42055 "EHLO ead42.ead.dsa.com") by vger.kernel.org with ESMTP id ; Fri, 5 Oct 2001 14:22:09 -0400 Date: Fri, 5 Oct 2001 14:22:15 -0400 From: "Bill Rugolsky Jr." To: Alan Cox Cc: linux-kernel@vger.kernel.org, lm@bitmover.com, jgiglio@smythco.com Subject: Re: 3ware discontinuing the Escalade Series Message-ID: <20011005142215.C1221@ead45> In-Reply-To: <20011005125259.B1221@ead45> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.4i In-Reply-To: ; from alan@lxorguk.ukuu.org.uk on Fri, Oct 05, 2001 at 06:05:49PM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 05, 2001 at 06:05:49PM +0100, Alan Cox wrote: > > I really like my 7800. At this point I guess I'm going to convert from > > hard to soft RAID, on the theory that (unfixed) bugs in the firmware are less > > likely to botch JBOD. > > Except for RAID5 the softraid is also likely to outperform a hardware raid > controller. With RAID5 its a CPU usage tradeoff Nod. I tested both configurations when I first got the cards, and RAID0 and RAID10 tests with a dual Athlon and the 3ware 7800 showed Linux soft-RAID outperforming. I didn't save the hard-RAID results, but the following is from a private e-mail I sent early in the summer: RedHat 2.4.5-10smp on dual-Athlon 1.2GHz, 1GB RAM Soft RAID0 with 4 IBM 41GB 7200RPM ATA-100 drives, chunk size 32K ext2 w/4K blocks: Version 1.01c ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP Tyan Thunder 10G 68828 99 138838 75 47756 33 48848 90 116166 61 229.2 1 K7 1.2GHz ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 1208 100 +++++ +++ 16883 94 1220 100 +++++ +++ 4476 99 I've been using hard-RAID simply because I've been playing with ext3 and LVM, and eliminating MD was one less interaction to worry about until now. -Bill Rugolsky - 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/