From owner-freebsd-stable@FreeBSD.ORG Thu Nov 9 01:13:58 2006 Return-Path: X-Original-To: freebsd-stable@FreeBSD.ORG Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9CD5E16A412 for ; Thu, 9 Nov 2006 01:13:58 +0000 (UTC) (envelope-from petefrench@ticketswitch.com) Received: from mail.ticketswitch.com (mail.ticketswitch.com [194.200.93.188]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3CBAD43D70 for ; Thu, 9 Nov 2006 01:13:57 +0000 (GMT) (envelope-from petefrench@ticketswitch.com) Received: from [172.16.1.6] (helo=dilbert.firstcallgroup.co.uk) by mail.ticketswitch.com with esmtp (Exim 4.60 (FreeBSD)) (envelope-from ) id 1GhyUO-000E45-H7 for freebsd-stable@FreeBSD.ORG; Thu, 09 Nov 2006 01:13:56 +0000 Received: from petefrench by dilbert.firstcallgroup.co.uk with local (Exim 4.61 (FreeBSD)) (envelope-from ) id 1GhyUM-000Oct-6G for freebsd-stable@FreeBSD.ORG; Thu, 09 Nov 2006 01:13:54 +0000 To: freebsd-stable@FreeBSD.ORG Message-Id: From: Pete French Date: Thu, 09 Nov 2006 01:13:54 +0000 Cc: Subject: Dissapointing performance of ciss RAID 0+1 ? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Nov 2006 01:13:58 -0000 I recently overhauled my RAID array - I now have 4 drives arranged as RAID 0+1, all being 15K 147gig Fujitsu's, and split across two buses, which are actively terminated to give U160 speeds (and I have verified this). The card is a 5304 (128M cache) in a PCI-X slot. This replaces a set of 6 7200 rpm drives as RAID 5 which were running at 40meg speeds due to non LVD termination. I would expect to see a large speed increase wouldn't I ? But it remains about the same - around 45 meg/sec for reading a large file (3 gig or so) and half that for copying said file. These are 'real world' tests in the sense that I us the drive for building large ISo images and copying them around - I really dont care what benchmarks say, it's the speed of these two operatiosn that I want to make fats. I've tried all the possible stripe sizes (128k gives the best performance) but still I only get the above speeds. Just one of the 15k drives on it's own performs better than this! I would expect the RAID-0 to give me at least some speedup, or in the worst case be the same, surely ? Booting up Windowws and running some tests gives me far better performance however, so I am wondering if there is some driver issue here. Has anyone else seen the same kind of results ? I am running the latest stable for amd64 and the machine has twin opteron 242's with a gig of RAM each. surely it can do better than this ? -pcf.