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Date:      Wed, 20 Mar 2002 11:28:41 -0800 (PST)
From:      Matthew Dillon <dillon@apollo.backplane.com>
To:        David Greenman <dg@root.com>
Cc:        "Steve O'Hara-Smith" <steve@sohara.org>, mrcpu@internetcds.com, clash@tasam.com, questions@FreeBSD.ORG, stable@FreeBSD.ORG
Subject:   Re: Problems with large disk. (> 1 TB)
Message-ID:  <200203201928.g2KJSfZ85089@apollo.backplane.com>
References:  <20020319131556.D99985@backmaster.cdsnet.net> <008901c1cf8c$be5d6f50$090510ac@gleason> <00b401c1cf8d$8960b7c0$090510ac@gleason> <20020319202137.U68606@backmaster.cdsnet.net> <20020320081439.74ca4530.steve@sohara.org> <20020319232049.W75496@nexus.root.com> <20020320190727.1cb65fac.steve@sohara.org> <20020320110647.A96231@nexus.root.com>

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:>	I thought fdisk slices were separate devices to FreeBSD so it should
:>be possible to put 1TB on each. Where did I go wrong this time, does FreeBSD
:>need to see the whole drive as a single device too ?
:
:   They're only seperate devices in the same sense that a different partition
:is a different device. In both cases this is just a software abstraction.
:FreeBSD internally calculates an offset within the whole disk when individual
:slices/partitions are accessed, so the underlying whole device must be less
:that 1TB as well. Fixing this requires updating the kernel all the way from
:the device drivers to the highest levels in the kernel, and even some system
:applications.
:
:-DG
:
:David Greenman
:Co-founder, The FreeBSD Project - http://www.freebsd.org

    I don't know if we will ever be able to fix this in -stable, but Kirk is 
    planning on changing block numbers from 32 to 64 bits in -current
    as part of his UFS64 work.  I don't think he's tackled the disklabel
    issue yet, but I presume that he will.

    Until then we are effectively limited to 1TB of physical storage per
    logical drive.

						-Matt


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