Date: Thu, 13 Jan 2000 13:30:13 +1300 From: Joerg Micheel <joerg@cs.waikato.ac.nz> To: "Kenneth D. Merry" <ken@kdm.org> Cc: freebsd-hardware@freebsd.org Subject: Re: hardware Message-ID: <20000113133013.L5228@cs.waikato.ac.nz> In-Reply-To: <20000112170836.B93083@panzer.kdm.org>; from Kenneth D. Merry on Wed, Jan 12, 2000 at 05:08:37PM -0700 References: <387D0354.63159B8@ddsecurity.com.br> <72218.947717759@verdi.nethelp.no> <20000113124314.I5228@cs.waikato.ac.nz> <20000113125237.J5228@cs.waikato.ac.nz> <20000112170836.B93083@panzer.kdm.org>
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On Wed, Jan 12, 2000 at 05:08:37PM -0700, Kenneth D. Merry wrote: > 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. Hmm, I have seen 1.7MB with this dump. > If a file-based backup is acceptable, you could probably get a lot better > performance by going through the filesystem. Interesting thought, will try. > > Time for LTO to show up. > > What's LTO? Linear Tape Open, looks like pretty accepted technology: http://www.lto-technology.com/ Or search on the HP website for Ultrium. Joerg -- Joerg B. Micheel Email: <joerg@cs.waikato.ac.nz> Waikato Applied Network Dynamics Phone: +64 7 8384794 The University of Waikato, CompScience Fax: +64 7 8384155 Private Bag 3105 Pager: +64 868 38222 Hamilton, New Zealand Plan: TINE and the DAG's To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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