Date: Mon, 14 Nov 2005 16:22:52 -0800 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Attila Nagy <bra@fsn.hu> Cc: freebsd <freebsd-hackers@freebsd.org> Subject: Re: UFS2 max limits? Message-ID: <20051115002252.GB79020@funkthat.com> In-Reply-To: <43777D24.2060606@fsn.hu> References: <84dead720511112135j435a3723ld15a9d993bbae9cc@mail.gmail.com> <43777D24.2060606@fsn.hu>
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Attila Nagy wrote this message on Sun, Nov 13, 2005 at 18:51 +0100:
> Joseph Koshy wrote:
> >The Wikipedia page referenced below says that UFS2 supports a
> >filesystem size of 2^80 Bytes (1YiB) with the limit on a given
> >file being 2^55 bytes (32 PiB).
> >Are these numbers correct? I somehow remember the limits as
> >being much lower (of the order of 16TB or so).
> I could only create a 128TB sparse file on an UFS2 partition, so I guess
> 32 PB is a little bith high.
No, it is not... The reason you were limited to 128TB is that you did
not create your filesystem with -f 65536 -b 65536... If you look at
my equation that I posted earlier, if you have a blocksize of 16384,
you end up with ~128TB as the max file size...
K M G T
(16384/8)^3*16384 / 1024 / 1024 / 1024 / 1024 == 128
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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