From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Wed, 26 Sep 2007 10:55:29 -0700 (PDT) Received: from web32904.mail.mud.yahoo.com (web32904.mail.mud.yahoo.com [209.191.69.81]) by oss.sgi.com (8.12.11.20060308/8.12.10/SuSE Linux 0.7) with SMTP id l8QHtKKd005615 for ; Wed, 26 Sep 2007 10:55:23 -0700 Date: Wed, 26 Sep 2007 10:55:19 -0700 (PDT) From: "Bryan J. Smith" Reply-To: b.j.smith@ieee.org Subject: Re: Re: mkfs options for a 16x hw raid5 and xfs (mostly large files) In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Message-ID: <347332.44288.qm@web32904.mail.mud.yahoo.com> Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: Justin Piszcz , b.j.smith@ieee.org Cc: Ralf Gross , linux-xfs@oss.sgi.com Justin Piszcz wrote: > I agree and this makes sense but in real-world loads it makes me > wonder, at least with the 2.4 kernel. It took 3Ware (actually AMCC) a good 18 months to get the firmware and driver tuned well. I purposely avoided any new 3Ware solution until a good 12-18 months after release because of such. The 9550SX series was the first microcontroller approach (PowerPC 400 series) done by 3Ware. All of their prior designs were an older 64-bit ASIC design with SRAM (and only DRAM slapped on, poorly, in the 9500S), which only worked well for RAID-0/1/10, not 5. That was well into the 2.6 era. I'd say you're well out of date with what 3Ware, let alone the Intel X-Scale-based Areca, are actually capable of with RAID-5/6 now. -- Bryan P.S. Both AMD and Intel are currently putting serious R&D into the first embedded x86 designs with added ASICs for Network, Storage, etc... I.e., this is going to be mainstream shortly, as AMD got out of 29000 long ago, and Intel is putting less and less focus on IOP33x/34x X-Scale. NPE, SPE and other units can literally handle DTRs that are 10x of what a general CPU/interconnect LOAD-op-STOR can do. I.e., Don't be surprised when your 2009+ server mainboard ICH is actually an embedded x86 processor with NPE and SPE units. That will finally remove the whole "separate card" in general. -- Bryan J. Smith Professional, Technical Annoyance b.j.smith@ieee.org http://thebs413.blogspot.com -------------------------------------------------- Fission Power: An Inconvenient Solution