Date: Mon, 5 Mar 2001 16:45:19 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Greg Lehey <grog@lemis.com> Cc: Warner Losh <imp@harmony.village.org>, sthaug@nethelp.no, freebsd-hackers@FreeBSD.ORG Subject: Re: Missing support in FreeBSD for large file sizes? Message-ID: <200103060045.f260jJg47532@earth.backplane.com> References: <13458.983813064@verdi.nethelp.no> <200103060023.f260Nrd24686@harmony.village.org> <20010306110821.H13082@wantadilla.lemis.com>
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:In fact, at the moment we don't seem to be able to build file systems
:of more than 1 TB. This may be a bug.
:
:Greg
2^31 x 512 = 1TB (negative block numbers are 'special'). Not really
a bug. Though I seem to recall a year or two ago someone had created
a much larger partition, I'm not quite sure how it could have worked.
As far as I understand the system we convert a block numbers to 512 byte
blocks at the device layer so even FFS filesystems w/ large block sizes
wouldn't be sufficient to get past the kernel limitation.
We just have to convert everything to 64 bit offsets all the way
through, especially with 500GB+ drives coming to market probably this
year sometime.
-Matt
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