On Fri, Dec 14, 2007 at 01:06:26PM -0500, Terry Lemons wrote:
> Also, the first two files on a NetWorker tape are the label and the backup 
> label, respectively; each is 32 KB long.  So, if you rewind the tape to the 
> beginning, the first and second 'dd' you use should be:
> 
> dd if=/dev/rmt/0cbn bs=32k count=1 | od -c
> 
> The block size of the third and following files will depend on the device 
> type; NetWorker specifies a default block size for every output device.
> 

When testing like this, I normally just use 64k unless there's a
problem.  When reading from a tape, if the block size is too large,
it'll just keep reading.  If the block size is too small, you will
usually get an error from the tape device driver (at least on
unix... I'm not sure what windows/cygwin will do).

I've not used cygwin for block device operations before.  Does it expose
the \\TAPExxxx names in some way that they can be recognized?

-- 
Darren Dunham                                           ddunham AT taos DOT com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
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