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Date:      Thu, 29 Apr 1999 11:55:43 -0700 (PWT)
From:      Matthew Jacob <mjacob@feral.com>
To:        "Christopher T. Johnson" <cjohnson@neunacht.netgsi.com>
Cc:        freebsd-current@freebsd.org
Subject:   Re: Further on tape & CAM problems
Message-ID:  <Pine.LNX.4.04.9904291146410.30271-100000@feral.com>
In-Reply-To: <Pine.LNX.4.04.9904281605430.26302-100000@feral.com>

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> 
> > > and/or CAM issues. 
> > > 
> > > Has anyone tried a CAMDEBUG kernel and camcontrol tracing on?
> > 
> > I'll be glad to turn it on if you tell me how to do it on only that
> > tape drive.  I'm getting ready for another mt erase test and that
> > will take about an hour and a half.
> > 
> > 
> > I'm rebuilding the kernel now with camdebug turned on.  I'll do the
> > mt erase with -I -T -S -c 0:4 and see what happens.
> 
> 
> Please.  This is what I meant. This is a -current system, right? I
> actually have an ancient 8200 so I should be able to replicate the problem
> if we figure out the deal on this.


Let me know... I've hooked back up my 8200 for some testing again.

There's a new variant to the 'mt stat' command in -current (it made it to
3.1-STABLE too):

quarm.feral.com > mt -f /dev/rsa3.ctl stat
Mode      Density              Blocksize      bpi      Compression
Current:  default              variable       0        unsupported
---------available modes---------
0:        default              variable       0        unsupported
1:        default              variable       0        unsupported
2:        default              variable       0        unsupported
3:        default              variable       0        unsupported
---------------------------------
Current Driver State: Writing.
---------------------------------
File Number: 0  Record Number: 7


so you can print out the driver's notion of what it is doing if things are
mysteriously hung. That could give a clue where the breakage is (like, if
the driver says it's state is 'at rest' the problem is possibly outside
the sa driver).

-matt




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