From owner-freebsd-hackers Fri Sep 22 16: 0:35 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (Postfix) with ESMTP id CE8D037B422 for ; Fri, 22 Sep 2000 16:00:32 -0700 (PDT) Received: from beppo.feral.com (beppo [192.67.166.79]) by feral.com (8.9.3/8.9.3) with ESMTP id QAA14666; Fri, 22 Sep 2000 16:00:20 -0700 Date: Fri, 22 Sep 2000 16:00:14 -0700 (PDT) From: Matthew Jacob Reply-To: mjacob@feral.com To: Shannon Hendrix Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: SCSI tape speed In-Reply-To: <20000922185736.C5978@widomaker.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG How about some more details? I'm beginning to wonder if buffered mode got broken. I do know I just did some tests with a DDS3 drive and I consistently got 1MB/s or better on dumps. On Fri, 22 Sep 2000, Shannon Hendrix wrote: > > > I'm interested in hearing from anyone who uses DAT drives on a DPT SCSI > controller, preferrably with FreeBSD 4.1 and an Intel system. > > I find the speed is very slow, and I know in the past these drives were fine > with FreeBSD, though I can't remember which release now. With my most recent > install of FreeBSD 4.1, I am lucky to get 3MB/minute on a drive and controller > combination that I know can hit 45MB/min. > > Right now, with NetBSD on an old Sparc 5, they still get 20MB/min or better. > > No errors, even large restores are perfect, but take many hours to finish. > > The controller I have is a DPT-2044W, and it currently has the ROM version DPT > suggested for use with tape drives. The drives in question are an Archive > Python 4-tape robot and a Seagate Scorpion. Both are DDS2 drives. > > No load on the DPT except for tapes and a CD-ROM burner. > > I haven't been able to find much information on this particular setup, and > most tape woes seem error related, or related to another platform. > > > -- > "Those who trade liberty for security will have neither -- | | | > (??)" | | | > ________________________________________________________________ / | \ > s h a n n o n @ w i d o m a k e r . c o m _/ | \_ > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message