From owner-freebsd-questions Sun Apr 16 14:45:59 1995 Return-Path: questions-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id OAA15468 for questions-outgoing; Sun, 16 Apr 1995 14:45:59 -0700 Received: from hutcs.cs.hut.fi (root@hutcs.cs.hut.fi [130.233.192.2]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id OAA15462 for ; Sun, 16 Apr 1995 14:45:57 -0700 Received: from shadows.cs.hut.fi by hutcs.cs.hut.fi with SMTP id AA02259 (5.65c8/HUTCS-S 1.4 for ); Mon, 17 Apr 1995 00:45:48 +0300 From: Heikki Suonsivu Received: (hsu@localhost) by shadows.cs.hut.fi (8.6.10/8.6.10) id AAA02796; Mon, 17 Apr 1995 00:46:01 +0300 Date: Mon, 17 Apr 1995 00:46:01 +0300 Message-Id: <199504162146.AAA02796@shadows.cs.hut.fi> To: steve@khoros.unm.edu (Steven Jorgensen) Cc: freebsd-questions@freefall.cdrom.com In-Reply-To: steve@khoros.unm.edu's message of 15 Apr 1995 12:03:48 +0300 Subject: DAT tape compat? Organization: Helsinki University of Technology, Otaniemi, Finland Sender: questions-owner@FreeBSD.org Precedence: bulk for different versions of Unix. I am currently running a SCSI Wangtek DAT tape drive under Freebsd 2.0, and tapes I create can be read by all other DAT drives I've tried it on. However, when I try to make a tape to bring home, the only thing that seems to be able to create tapes that I can read is a 486 running BSDOS. Tapes created on our Sun DAT or the DEC Alpha DAT can be read. All I get is a Tape error.. Do these DAT's create some specialized propriety format that we just don't support, or am I not configuring something correctly on my system? Any help appreciated. I have a little bit different symptoms: - I can write tapes quickly on any system. - I can read them, but they come out very slowly (< 20kB/s). - The tapes themselves seem to be ok, they can be read though, it just takes a week to do it. - I have tried 3 tape drives of same type. - If I take the drive and attach it into a Sun SS10, reading the FreeBSD-written tapes is still slow. - If I write the tape on a SS10, it can be read quickly on SS10 reading works fine (several hundred kB/s). - Both 1.1.5.1 and early 2.* did this, but I have done less testing on 2.*. - I haven't tried reading SS10-written tape on a FreeBSD system. - The drive is 3400 with compression (DX I think). - I have tried number of different block sizes with no difference. It seems to be a drive problem which is woken up by the FreeBSD driver or by the way I write the tapes (its all dd, which would seem to be sensible, though). I guess I should write a tape for wangtek so that they could check out why this happens... -- Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND, hsu@cs.hut.fi home +358-0-8031121 work -4513377 fax -4555276 riippu SN