Date: Wed, 31 Oct 2001 10:40:51 -0800 From: Kris Kennaway <kris@obsecurity.org> To: David Greenman <dg@root.com> Cc: Kris Kennaway <kris@obsecurity.org>, Ngoclan Vu <lanvu6@home.com>, questions@FreeBSD.ORG Subject: Re: FreeBSD 1TB filesystem limitation Message-ID: <20011031104051.A29014@xor.obsecurity.org> In-Reply-To: <20011031094347.A99559@nexus.root.com>; from dg@root.com on Wed, Oct 31, 2001 at 09:43:47AM -0800 References: <KIENKGBKAGMICBJDIJGCGENMCCAA.lanvu6@home.com> <20011031021107.A23867@xor.obsecurity.org> <20011031094347.A99559@nexus.root.com>
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--vtzGhvizbBRQ85DL Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Oct 31, 2001 at 09:43:47AM -0800, David Greenman wrote: > >On Tue, Oct 30, 2001 at 06:21:56PM -0800, Ngoclan Vu wrote: > >> Hi, > >>=20 > >> Do you have suggestions as to how to deal with the FreeBSD file system > >> limitation of 1TB? Is it possible to get beyond this limitation? Are = there > >> other file system for FreeBSD that do not have this 1TB limitation. > > > >It's not a limitation in FreeBSD per se, it's a limitation in how you > >built your filesystem. Read the newfs and tuning manpages and rebuild > >your filesystem with e.g. a larger block and fragment size. >=20 > Actually it is a limitation in FreeBSD. The 1TB limit isn't a filesyst= em > limit, however, it's a limit on the maximum size of a disk device caused = by > disk block pointers (daddr_t) being 32 bit signed integers and physical d= isk > blocks being 512 bytes large. 2 billion 512 byte blocks is 1TB. There is = no > way in FreeBSD to make physical disk block sizes different than 512 bytes. > Fixing this requires making daddr_t larger and that affects huge chunks of > the kernel. I would say that it's at least several man-months of work for > someone who is very familiar with the code. Oops, I was confusing this case with the limitations on file size. Kris --vtzGhvizbBRQ85DL Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE74EWyWry0BWjoQKURAvpNAJsHnI5/7ZcnwM6fqpvpk388imbwNACeMLq5 TrKeAGmE36WvsbU1t++OeEo= =j3B9 -----END PGP SIGNATURE----- --vtzGhvizbBRQ85DL-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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