From owner-freebsd-hardware Wed Jan 12 16: 8:51 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id BA8C114D8C for ; Wed, 12 Jan 2000 16:08:45 -0800 (PST) (envelope-from ken@panzer.kdm.org) Received: (from ken@localhost) by panzer.kdm.org (8.9.3/8.9.1) id RAA93210; Wed, 12 Jan 2000 17:08:37 -0700 (MST) (envelope-from ken) Date: Wed, 12 Jan 2000 17:08:37 -0700 From: "Kenneth D. Merry" To: Joerg Micheel Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: hardware Message-ID: <20000112170836.B93083@panzer.kdm.org> References: <387D0354.63159B8@ddsecurity.com.br> <72218.947717759@verdi.nethelp.no> <20000113124314.I5228@cs.waikato.ac.nz> <20000113125237.J5228@cs.waikato.ac.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <20000113125237.J5228@cs.waikato.ac.nz>; from joerg@cs.waikato.ac.nz on Thu, Jan 13, 2000 at 12:52:37PM +1300 Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Thu, Jan 13, 2000 at 12:52:37 +1300, Joerg Micheel wrote: > Regarding the Barracuda ST150176LW ... > > I'd like to comment that the real problem with this drive is rather on > the backup side. I'm using a DDS4 drive (40GB compressed, 20GB raw) and > I get about 10GB / hour backup performance. Both the disk and the tape > drive are on the same SCSI channel. The disk is almost full, lots of > gzip'ed data on it. It took me an estimated 8 hours and 3 DDS4 tapes for > the complete dump 0. dump is notoriously slow. I've got a number of systems that back up onto a central AIT drive at work. We're pushing close to 50G per night onto one AIT tape (maximum we've gotten is 55GB on a 170m AIT-1 tape), and it takes 9.5-10 hours to do the backup. The speed isn't limited by the network (switched 100BaseT) or the drive (AIT drives can handle a good bit more than the 1.4MB/sec or so we're throwing at it.) The limiting factor is dump. If a file-based backup is acceptable, you could probably get a lot better performance by going through the filesystem. > Time for LTO to show up. What's LTO? Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message