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Date: Fri, 27 Aug 2004 14:21:08 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Very slow SCSI tape drive with cygwin/Win2kPro
Message-ID: <20040827122108.GP27978@cygbert.vinschen.de>
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References: <200408270713 DOT 32596 DOT whn AT lopi DOT com>
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On Aug 27 07:13, Bill Nugent wrote:
> Hi Corinna,
> 
> Setting tar's -b size up resulted in a radical increase.  Still not 
> streaming but real close and workable.  Reading in a 100GB tape with 
> 500MB to 1,500MB files should take about three or four hours instead of 
> three weeks!  I'm going to keep experimenting to see if I can get it to 
> stream which should bring it down to 2 hours.  Thank you!
> 
> In experimenting I found '-b 20480' was "too large" and did not work.  I 
> have not had a chance to determine at what size tar breaks.
> 
> Any idea why I can't set the block size greater than 32K using
> "mt setblk"?  We have a number of tapes which have a 64K block size and 

So you didn't look into the `mt status 3' output?  I've marked it in my
original reply.  It's the Windows driver value for the maximum block size.
That has nothing to do with Cygwin.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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