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Date:      Tue, 15 Dec 1998 13:10:20 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Dave Ason <dgason@mindspring.com>, freebsd-questions@FreeBSD.ORG
Subject:   Re: Biggest sized file system?
Message-ID:  <19981215131020.F15633@freebie.lemis.com>
In-Reply-To: <3675C14F.FDB9FE1@mindspring.com>; from Dave Ason on Mon, Dec 14, 1998 at 08:54:23PM -0500
References:  <3675C14F.FDB9FE1@mindspring.com>

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On Monday, 14 December 1998 at 20:54:23 -0500, Dave Ason wrote:
> Hi there,
>
> 	On some older UNIX systems I have administered, the biggest file system
> I could create was 2GB. What is the biggest file system that can be
> created with FreeBSD 3.0?

With 4.4BSD, UFS went to 64 bit pointers, which implies a maximum file
size of 1.8 * 10**19 bytes.  I don't know if there are other
restrictions (apart from hardware availablity) to restrict the size to
less than this, but I do know that somebody recently created a 72 GB
file system on a FreeBSD system:

> df -k
Filesystem        1K-blocks     Used    Avail Capacity  Mounted on
/dev/da0s2a           63503    21274    37149    36%    /
/dev/da0s2f           63503        1    58422     0%    /tmp
/dev/da0s2g         1714353   694290   882915    44%    /usr
/dev/da0s2e           63503     2212    56211     4%    /var
procfs                    4        4        0   100%    /proc
/dev/vinum/bigvol  69109710 10056279 53524655    16%    /alexandria

Elsewhere I've heard of (unspecified) problems limiting file size to
about 500 GB.  These could be related to addressability, and wouldn't
necessarily apply to the file system.

Greg
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