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Date:      Tue, 15 Feb 2000 11:24:30 -0800
From:      John Milford <jwm@CSUA.Berkeley.EDU>
To:        Peter Wemm <peter@netplex.com.au>
Cc:        Joe Greco <jgreco@ns.sol.net>, hackers@FreeBSD.ORG
Subject:   Re: Filesystem size limit?
Message-ID:  <200002151924.LAA02584@soda.csua.Berkeley.edu>
In-Reply-To: Message from Peter Wemm <peter@netplex.com.au> of "Tue, 15 Feb 2000 22:18:10 %2B0800." <20000215141810.AACBC1CD9@overcee.netplex.com.au>

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Peter Wemm <peter@netplex.com.au>  wrote:

>
> /usr/include/sys/disklabel.h:
>            u_int32_t p_size;       /* number of sectors in partition */
>
> newfs.c:
> int     fssize;                 /* file system size */
> ..
> havelabel:
>         if (fssize == 0)
>                 fssize = pp->p_size;
>
> ie: there is a signed 32 bit sector count limit.  2^31 == 1TB.  It shouldn't
> be too hard to get it to create 2^32 bit (2TB) filesystem though.  I'd expect
> there to be more problems that this to bite you though. :-(
>
> 2^31 also happens to be the mmap() file offset limit FWIW.
>
> BTW; what on earth is going on this beastie?  Is this raid5 or stripe/concat?
> (And I'd hate to be waiting for a fsck :-)
>
> Cheers,
> -Peter
>
>
>
	Is there any real interest in moving beyond 1TB?  I think that
it would incur a non-trival overhead as I believe that unsigned ints
would not work and we would be looking at going to 64 bit values.  Or
I guess something could be done to simulate larger sectors, but that
is pure speculation.

			--John


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