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Date: Wed, 31 Oct 2001 12:58:40 +0000
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From: Richard Kettlewell <rjk@greenend.org.uk>
To: <linux-kernel@vger.kernel.org>
Subject: Re: problem with ide-scsi and IDE tape drive
In-Reply-To: <Pine.LNX.4.33.0110311347580.3081-100000@kai.makisara.local>
In-Reply-To: <wwvady8vhfs.fsf@rjk.greenend.org.uk>
	<Pine.LNX.4.33.0110311347580.3081-100000@kai.makisara.local>
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Kai Makisara writes:

> Looking at your log everything seems to work perfectly from the
> point of view of the drivers. The problem is that the first write
> command (from the log cmd: a 1 0 0 3c 0 Len: 30720) is refused by
> your drive (the sense key Illegal Request). The command looks OK
> (i.e., it is a write of 60 512 byte blocks in fixed block mode).

OK...

> Does your drive only accept writes from the beginning of the tape
> (there are drives that have this limitation)?

The manual doesn't mention any such limitation, but it's not very
comprehensive.  Suggestions how I can find out whether the drive is
supposed to support arbitrarily positioned writes or not would be
welcome.

> In this case the problem is that you rewind and space forward
> between the two tar commands. You don't have to rewind between the
> commands. The same result is obtained if you just use two
> consecutive tar commands (and this means that writing only starts
> from the beginning of the tape, from the drive's point of view).

This points to an acceptable workaround.

Thanks for your help!

ttfn/rjk
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