From owner-freebsd-stable@FreeBSD.ORG Fri Nov 10 08:11:30 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 8C84E16A403 for ; Fri, 10 Nov 2006 08:11:30 +0000 (UTC) (envelope-from ralf.folkerts@gmx.de) Received: from mail.gmx.net (mail.gmx.de [213.165.64.20]) by mx1.FreeBSD.org (Postfix) with SMTP id C6D5E43D46 for ; Fri, 10 Nov 2006 08:11:29 +0000 (GMT) (envelope-from ralf.folkerts@gmx.de) Received: (qmail invoked by alias); 10 Nov 2006 08:11:28 -0000 Received: from dslb-084-057-187-108.pools.arcor-ip.net (EHLO [10.0.0.50]) [84.57.187.108] by mail.gmx.net (mp036) with SMTP; 10 Nov 2006 09:11:28 +0100 X-Authenticated: #18511927 Message-ID: <4554342F.7040309@gmx.de> Date: Fri, 10 Nov 2006 09:11:27 +0100 From: Ralf Folkerts Organization: Wohnzimmerrechenzentrum User-Agent: Thunderbird 1.5.0.7 (X11/20060917) MIME-Version: 1.0 To: freebsd-stable@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Subject: Remote Tape slow.... 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: Fri, 10 Nov 2006 08:11:30 -0000 Hi, I recently replaced an old DDS-II Tape with a not so old AIT-Tape in one of my FBSD-Boxes. However, access via RMT is really slow :-( When I perform a local dump of the machines that hosts the drive I get 4 - 6MB/s throughput. I get roughly the same speed, when I move the Tape to one of the other machines and perform a local dump. However, when I set "RSH=/usr/bin/ssh" and then dump to user@tape-machine:/dev/sa0 (I didn't change any of the other dump-Parameters like Blocksize etc.) I get a speed of ~1MB/s. I tried this both with good old 3Com 3C905TX(100MBit) and DLink DGE-530T (1GBit). The Drive is atached to an Adaptec 2940UW, the "normal" Machine that Hosts that Drive is a PIII/733MHz Box with 512MB RAM. During the dump none of the machines really show up with Load; they are ~0.15/0.20. Is this the expected behaviour of RMT? I thought I could expect (nearly) the speed of a locally atached Drive. Or is there something to tune so I get better throughput? I already searched the Lists, Manual and G* but ddin't find a real hint :-( Would be great if I could speed this up... MTIA! Cheers, _ralf_