Date: Thu, 15 Feb 1996 11:35:55 +0100 From: Wolfram Schneider <wosch@cs.tu-berlin.de> To: Greg W Hassan <gwhassan@cs.buffalo.edu> Cc: questions@freebsd.org Subject: max file size/disk size? Message-ID: <199602151035.LAA00255@localhost> In-Reply-To: Greg W Hassan's message of Wed, 14 Feb 1996 09:23:18 -0500
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>i'm looking for the max file size and the largest disk size? > >i have tried to calculate it but it seems too big. > >i believe the file size variable in the kernel is an >unsigned long long, which would turn out to be 2^64. i think >like 1.6 million terabytes. [mmap(2) man page from -current] The limit is imposed for a variety of reasons. Most of them have to do with FreeBSD not wanting to use 64 bit offsets in the VM system due to the extreme performance penalty. So FreeBSD use 32bit page indexes and this gives FreeBSD a maximum of 8TB filesizes. It's actually bugs in the filesystem code that causes the limit to be further restricted to 1TB (loss of precision when doing blockno calculations).
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