Have you try manually adjust the tape drive block size?

----- Original Message ----
From: A Darren Dunham <ddunham AT TAOS DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Sent: Thursday, January 17, 2008 6:11:30 AM
Subject: Re: [Networker] Problem recovering data due to block size?


On Wed, Jan 09, 2008 at 07:08:26PM -0500, George Sinclair wrote:
> Wed 20:46:29 media notice: Volume "vol04" on device 
> "rd=scribe:/dev/nst6": Block size is 512 bytes not 65536 bytes.
 Verify 
> the device configuration. Tape positioning by record is disabled.
> 
> It just sits there with the message: "reading, moving forward 3232 
> record(s)." The tape drive is blinking, but hard to tell what's
 happening.

Since it can't forward by records, it's now reading through the tape.
Worse, it may be reading through with the tape handing back 512byte
chunks.

I've never seen this with Networker, but I did see this once on
Netbackup.  We had a mess of catalog tapes that I was examining.  *one*
tape (the one I really wanted at the time) for some odd reaon had
512byte chunks on the tape.  Instead of a 2 hour recovery, it was
 taking
several days....  You could see the same behavior with 'dd' and just
reading.  Even with large block sizes it was slow.  

-- 
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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