From owner-freebsd-stable@FreeBSD.ORG Wed Jan 14 05:02:06 2004 Return-Path: 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 AD8F716A4CE for ; Wed, 14 Jan 2004 05:02:06 -0800 (PST) Received: from nimitz.osl.fast.no (mailoslo.fast.no [217.144.235.131]) by mx1.FreeBSD.org (Postfix) with ESMTP id 45A0343D49 for ; Wed, 14 Jan 2004 05:02:05 -0800 (PST) (envelope-from Raymond.Wiker@fast.no) Received: from raw.grenland.fast.no.fast.no (raw.grenland.fast.no [192.168.48.104]) by nimitz.osl.fast.no (8.12.9/8.12.9) with ESMTP id i0ED23UB073020; Wed, 14 Jan 2004 14:02:03 +0100 (MET) From: Raymond Wiker MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16389.15817.322098.577889@raw.grenland.fast.no> Date: Wed, 14 Jan 2004 14:02:01 +0100 To: freebsd-stable@freebsd.org In-Reply-To: <200401141453.50150.ari@suutari.iki.fi> References: <200401141453.50150.ari@suutari.iki.fi> X-Mailer: VM 7.17 under 21.4 (patch 12) "Portable Code" XEmacs Lucid Subject: Adaptect raid performance with FreeBSD X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Jan 2004 13:02:06 -0000 Ari Suutari writes: > dd if=/dev/rda1s1a of=/dev/null bs=1m count=100 > 100+0 records in > 100+0 records out > 104857600 bytes transferred in 4.193832 secs (25002814 bytes/sec) > > So, I get only about 25MB/s. Shouldn't I be getting something > like 70 MB/s, or even more since there are two disks that > can server read requests ? Have you tried other block sizes? I think you may be able to get better results by going to a lower block size (e.g, 64k instead of 1m). Some experimentation will show which block size(s) work best.