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Date:      Tue, 19 Mar 2002 23:18:15 -0800
From:      David Greenman <dg@root.com>
To:        "Steve O'Hara-Smith" <steve@sohara.org>
Cc:        Joseph Gleason <clash@tasam.com>, mrcpu@internetcds.com, stable@FreeBSD.ORG, questions@FreeBSD.ORG
Subject:   Re: Problems with large disk. (> 1 TB)
Message-ID:  <20020319231815.V75496@nexus.root.com>
In-Reply-To: <20020320080934.3b8823d8.steve@sohara.org>; from steve@sohara.org on Wed, Mar 20, 2002 at 08:09:34AM %2B0100
References:  <20020319131556.D99985@backmaster.cdsnet.net> <008901c1cf8c$be5d6f50$090510ac@gleason> <20020320080934.3b8823d8.steve@sohara.org>

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>On Tue, 19 Mar 2002 16:26:32 -0500
>"Joseph Gleason" <clash@tasam.com> wrote:
>
>JG> I don't have a solution for you, but I am pretty sure I know the problem:
>JG> 
>JG> calc 2^31*512 = 1TB.
>
>	That points to one option - use vinum to concatenate two half
>terabyte subdiscs.

   That won't work around the problem. The Vinum device would then be too
large. The maximum device size is 1TB worth of 512 byte blocks due to the
size of a daddr_t (a signed 32 bit int). There is exactly one solution to
this problem, and that is to change pretty much the whole kernel to handle
64 bit daddr_t's. This is several man-months of work for someone very
familiar with the kernel internals.

-DG

David Greenman
Co-founder, The FreeBSD Project - http://www.freebsd.org
President, TeraSolutions, Inc. - http://www.terasolutions.com
President, Download Technologies, Inc. - http://www.downloadtech.com
Pave the road of life with opportunities.

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