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Date:      Sat, 19 Jul 1997 13:27:48 -0500
From:      dkelly@hiwaay.net
To:        Joachim.Wunder@lrz.tu-muenchen.de (Joachim Wunder)
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Reading a Solaris DAT tape with tar 
Message-ID:  <199707191827.NAA15805@nexgen.hiwaay.net>
In-Reply-To: Message from Joachim.Wunder@lrz.tu-muenchen.de (Joachim  Wunder) of "Fri, 18 Jul 1997 19:58:57 +0200." <9707181758.AA07352@sun1.lrz-muenchen.de> 

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Joachim.Wunder@lrz.tu-muenchen.de said:
> I am having problems reading a tar tape on a 90m DAT which was written
> under Solaris 2.4 with tar, too. I have a Sony SDT 5000.

> tar simply gives me

> 	tar: read error on molonita:/dev/nrst0 : Input/output error

> Of course I played around with the blocksize and tried to run dd
> before calling tar, but nothing worked so far. :( 

Not all DAT drives can read all DAT tapes. Think the SDT5000 has 
compression, but do you know if the Sun wrote the tape compressed or not? 
I've not had a DAT drive that supports compression so I don't know how to 
turn it on/off in FreeBSD.

Tried "man mt" and searched for "com", found an entry that said comp wasn't 
supported in mt, yet. And "man mtio" shows space allocated for supporting 
compressed modes with a comment that it isn't supported yet.

If the tape is compressed you might have to re-write it on a Sun.

You could have a DDS-1 tape, up to 2G for 90 meters.
Or a DDS-1 tape with compression, claimed up to 4G on 90 meters.
Or a DDS-2 tape which does 4G without compression
Or a compressed DDS-2 tape which is supposed to go 8G.
And recently DDS-3's have started shipping.

--
David Kelly N4HHE, dkelly@hiwaay.net
=====================================================================
The human mind ordinarily operates at only ten percent of its
capacity -- the rest is overhead for the operating system.





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