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Date:      Sat, 16 May 1998 19:33:06 -0300 (ADT)
From:      The Hermit Hacker <scrappy@hub.org>
To:        Chris Timmons <skynyrd@opus.cts.cwu.edu>
Cc:        scsi@FreeBSD.ORG
Subject:   Re: Atrocious transfer rates...
Message-ID:  <Pine.BSF.3.96.980516192345.580K-100000@thelab.hub.org>
In-Reply-To: <Pine.BSF.3.96.980515163943.10509A-100000@opus.cts.cwu.edu>

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On Fri, 15 May 1998, Chris Timmons wrote:

> 
> You'll also want to be careful with the L912 firmware on the XP34300W;
> there are known problems which are fixed in L915 firmware.
> cvsup.freebsd.org couldn't keep running on those disks until we upgraded
> the firmware.  Search the archives - Justin figured out the problem some
> time ago.
> 
> Probably CAM will treat you better than the old code did when the drives
> flake on you...

	Well, got hit by a system hang again tonight :(  Running a
0514/15 kernel, with the latest CAM snapshot...

	I hit AltaVista and did a search for XP34300W, and am curious
about one of the threads I found in the aic7xxx mailing list that was
found in the search.

	Basically, it describes the problem (under Linux, at least) as:

"The LED-light indicating SCSI activity on the computer front shines
constantly for about 30 secs, goes out for about 10 secs after which the
SCSI bus appears to be reset (my CD ROM-drive is activated momentarily)
and I can use the system again. "
	- http://confused.ume.maine.edu/~aic7xxx/aic7xxx/4988.html

	Now, I'm curious, but assuming that this is a bus hang (even with
the CAM drivers in place), why isn't the system able to recover?

	The report is based on the same drive as mine, including Rev...

Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: Quantum Model: XP34300W Rev: L912
Type: Direct-Access ANSI SCSI revision: 02

	One of the answers in this thread talks about 'SCSI bus
reset-requests' (http://confused.ume.maine.edu/~aic7xxx/aic7xxx/5000.html)
... assuming we do this, why doesn't it work?  Hell, I'd rather have my
system timeout and reboot when this happens then to just sit there doing
nothing :(


Marc G. Fournier                                
Systems Administrator @ hub.org 
primary: scrappy@hub.org           secondary: scrappy@{freebsd|postgresql}.org 


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