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Date: Tue, 24 Aug 2004 16:27:02 +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: <20040824142702.GG27978@cygbert.vinschen.de>
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References: <200408231840 DOT 52007 DOT whn AT lopi DOT com> <20040824100453 DOT GF27978 AT cygbert DOT vinschen DOT de>
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On Aug 24 12:04, Corinna Vinschen wrote:
> On Aug 23 18:40, Bill Nugent wrote:
> >  mt -f /dev/nst0 setblk 8192
> >  tar -tf /dev/nst0 -b 32
> 
> tar --help, especially the -b option.

Uhm... sorry, scratch that.

> > Block size does not seem to be a factor.  I've tried 8k, 16k and 32k 
> > (over 32k doesn't work for some reason).

I've just tried reading and writing on a Tandberg SLR7 which has a max.
speed of 6 MB/s, using 5K blocks on tape.  My testcase was a directory
of 645 MB, full of source code (lots of small files).

Using 10K blocks (-b20) for tar, I got roughly 850 KB/s on write and
1.25 MB/s on read. 

Using 1000K blocks (-b2000), I got 1.4MB/s on write and nearly the full
6 MB/s on read.


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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