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Date:      Fri, 29 May 1998 15:21:17 -0400 (EDT)
From:      Simon Shapiro <shimon@simon-shapiro.org>
To:        Michael Hancock <michaelh@cet.co.jp>
Cc:        "freebsd-current@freebsd.org" <freebsd-current@FreeBSD.ORG>, tcobb <tcobb@staff.circle.net>, Karl Pielorz <kpielorz@tdx.co.uk>
Subject:   Re: DPT driver fails and panics with Degraded Array
Message-ID:  <XFMail.980529152117.shimon@simon-shapiro.org>
In-Reply-To: <Pine.SV4.3.95.980529172341.4862B-100000@parkplace.cet.co.jp>

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On 29-May-98 Michael Hancock wrote:
> On Fri, 29 May 1998, Karl Pielorz wrote:
> 
>> One comment (and it's not a flame!) - honestly... ;-)
>> 
>> With an array of that size, on a machine that important - did you not
>> test
>> to see what would happen with a failed drive?
>> 
> 
> I recently got a DPT too for a production system but my needs were not as
> critical.  I use a SYM53C875 for the system disk and the DPT with 2
> mirrored drives for data.  I can do some experimentation during off hours
> with this system.
> 
> I would like to see the DPT stabilize such that large arrays could be
> used
> reliably so I'll try and test patches against 2.2.6, after I work out a
> budget to get more drives.

I am routinely running a Dual DPT with 38 drives on 6 busses.  On
3.0-CURRENT SMP.  The system did lose disk drives, either intentionally, or
by accident.  I cannot confirm any of Mr. Cobb's finding.  I have not been
funished with any data, including the panic point, which I suspect is not
in the DPT code.  I am still waiting for such data.

Simon


---


Sincerely Yours, 

Simon Shapiro                                           Shimon@Simon-Shapiro.ORG
                                                        770.265.7340

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