From owner-freebsd-questions@FreeBSD.ORG Wed Feb 3 10:51:42 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B0369106566B; Wed, 3 Feb 2010 10:51:42 +0000 (UTC) (envelope-from james-freebsd-fs2@jrv.org) Received: from mail.jrv.org (adsl-70-243-84-13.dsl.austtx.swbell.net [70.243.84.13]) by mx1.freebsd.org (Postfix) with ESMTP id C96408FC1A; Wed, 3 Feb 2010 10:51:41 +0000 (UTC) Received: from kremvax.housenet.jrv (kremvax.housenet.jrv [192.168.3.124]) by mail.jrv.org (8.14.3/8.14.3) with ESMTP id o13AF6Y1043770; Wed, 3 Feb 2010 04:15:06 -0600 (CST) (envelope-from james-freebsd-fs2@jrv.org) Authentication-Results: mail.jrv.org; domainkeys=pass (testing) header.from=james-freebsd-fs2@jrv.org DomainKey-Signature: a=rsa-sha1; s=enigma; d=jrv.org; c=nofws; q=dns; h=message-id:date:from:user-agent:mime-version:to:cc:subject: references:in-reply-to:content-type:content-transfer-encoding; b=XbLxPMEfxPhBS8EBaZFYLK1D7a7RoyNOfNtnrPb6a4i3R3pkxd4eb+gZH62IG1mZt sQFVy9lpG3gEo3PSmF4Mwm+pkYNaW7PP6uIvv1OKZdc+jfn1T664Gc/nyIYpQvxdNHp GiY2fYgFB16PK2C5yvHe7/4VRQ5UqS4wK0gD/Rk= Message-ID: <4B694CAA.60703@jrv.org> Date: Wed, 03 Feb 2010 04:15:06 -0600 From: "James R. Van Artsdalen" User-Agent: Thunderbird 2.0.0.23 (Macintosh/20090812) MIME-Version: 1.0 To: Dan Naumov References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-fs@freebsd.org, FreeBSD-STABLE Mailing List , freebsd-questions@freebsd.org Subject: Re: 8.0-RELEASE/amd64 - full ZFS install - low read and write disk performance X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Feb 2010 10:51:42 -0000 Dan Naumov wrote: > [jago@atombsd ~]$ dd if=/dev/zero of=/home/jago/test2 bs=1M count=4096 > 4096+0 records in > 4096+0 records out > 4294967296 bytes transferred in 143.878615 secs (29851325 bytes/sec) > > This works out to 1GB in 36,2 seconds / 28,2mb/s in the first test and > 4GB in 143.8 seconds / 28,4mb/s For the record, better results can be seen. In my test I put 3 Seagate Barracuda XT drives in a port multiplier and connected that to one port of a PCIe 3124 card. The MIRROR case is at about the I/O bandwidth limit of those drives. [root@kraken ~]# zpool create tmpx ada{2,3,4} [root@kraken ~]# dd if=/dev/zero of=/tmpx/test2 bs=1M count=4096 4096+0 records in 4096+0 records out 4294967296 bytes transferred in 20.892818 secs (205571470 bytes/sec) [root@kraken ~]# zpool destroy tmpx [root@kraken ~]# zpool create tmpx mirror ada{2,3} [root@kraken ~]# dd if=/dev/zero of=/tmpx/test2 bs=1M count=4096 4096+0 records in 4096+0 records out 4294967296 bytes transferred in 36.432818 secs (117887321 bytes/sec) [root@kraken ~]#