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Date:      Fri, 22 May 1998 16:23:48 -0700 (PDT)
From:      Tom <tom@uniserve.com>
To:        Raul Zighelboim <rzig@verio.net>
Cc:        "'Charles Owens'" <owensc@enc.edu>, Simon Shapiro <shimon@simon-shapiro.org>, Tom <tom@sdf.com>, freebsd-stable@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG
Subject:   RE: DPT install problem
Message-ID:  <Pine.BSF.3.96.980522162114.19615F-100000@shell.uniserve.ca>
In-Reply-To: <A03CD00C69B1D01195AB00A024ECEB1691F109@kaori.communique.net>

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On Fri, 22 May 1998, Raul Zighelboim wrote:

> My 0.02 cents:
> 	I did not installed FreeBSd on a DPT controller, but with an
> Adaptec controller.  Nevertheless, I have a DPT controller on a system
> with a large fs (71780140 1K blocks).  The system works, works well and
> has been up for 4 days as a very busy usenet news spool directory.
> 	This is running 2.2-RELENG from last sunday.

  Yes.  The DPT problem is related to sysinstall.  If I newfs afterwards,
everythings works ok.

> As a sidebar; the DOS configuration software can only create arrays with
> up to 1 mbyte interleave.  Is this a limitation on the hardware or the
> software ?  Is (will there be) a way to create an array with a larger
> interleave (32 megs comes to mind).

  That would not be a good idea, as the controller caches by the stripe.
So a 32MB stripe would allow you to cache only two stripes.

  It also depends on what RAID level you are using.  You probably wouldn't
see any benefit beyond 1MB stripes anyhow.

> 	Thanks, Simon, for a job well done.
> 
> ==================================================
> Raul Zighelboim       		  rzig@verio.net

Tom


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