Date: Mon, 17 Apr 1995 00:46:01 +0300 From: Heikki Suonsivu <hsu@cs.hut.fi> To: steve@khoros.unm.edu (Steven Jorgensen) Cc: freebsd-questions@freefall.cdrom.com Subject: DAT tape compat? Message-ID: <199504162146.AAA02796@shadows.cs.hut.fi> In-Reply-To: steve@khoros.unm.edu's message of 15 Apr 1995 12:03:48 %2B0300
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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
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