From owner-freebsd-hackers Mon Jun 5 06:43:31 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id GAA01082 for hackers-outgoing; Mon, 5 Jun 1995 06:43:31 -0700 Received: from temptation.interlog.com (temp@temptation.interlog.com [198.53.146.54]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id GAA01059 for ; Mon, 5 Jun 1995 06:43:00 -0700 Received: (from temp@localhost) by temptation.interlog.com (8.6.9/8.6.9) id JAA20995; Mon, 5 Jun 1995 09:39:29 -0400 Date: Mon, 5 Jun 1995 09:39:29 -0400 From: Temptation Subject: Re: why won't my tape drive keep streaming? To: Joerg Wunsch cc: Mike Pritchard , hackers@freebsd.org In-Reply-To: <199506051303.PAA03258@uriah.heep.sax.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: hackers-owner@freebsd.org Precedence: bulk I tested his program on my system. Archive 4gig Dat. with NCR and 2940. worked fine, start was a bit slow, but after that it stayed basically about the same mb/sec -+1/2 sec. I ran it about 20 times, to make sure, also loaded the system down, doing tars on the drive, running X, etc... The NCR slowed down a tiny bit, Never bother the 2940 at all. Since the 29/28/27 driver is same, Unless it's your card, I doubt, it might be you motherboard or the tape drive, maybe even the tape. (I'm guessing, could really be anything :) ) I'll try it again when I get FreeBSD on a machine with 2842. > As Mike Pritchard wrote: > > > > I have an Archive 2150S SCSI tape drive attached to An Adaptec 2842VL > > controller. This drive is capable of writing 6MB+ per minute, but > > I rarely see that under FreeBSD (running -current). > > I've been using an Archive Viper 150 for a long time (lately been > replaced by a Tandberg 3660). I never had problems with it, neither > with an Adaptec AHA-1540A, nor with the BusLogic Bt-742A i'm using > now. The tape usually kept streaming, resulting in 250 - 300 MB/h > backup speed. > > I remember that the Viper 150 has an additional jumper block (the > middle row) which determined some kind of a block size. The setting > of these jumpers actually had an effect on the possible speed of > operation, but i cannot remember the setting i've been using. > > -- > cheers, J"org > > joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ > Never trust an operating system you don't have sources for. ;-) >