From owner-freebsd-advocacy Thu Apr 8 0: 1:32 1999 Delivered-To: freebsd-advocacy@freebsd.org Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (Postfix) with ESMTP id BFE1C15888 for ; Thu, 8 Apr 1999 00:01:26 -0700 (PDT) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id QAA18637; Thu, 8 Apr 1999 16:29:25 +0930 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id QAA20826; Thu, 8 Apr 1999 16:29:20 +0930 (CST) Message-ID: <19990408162920.P2142@lemis.com> Date: Thu, 8 Apr 1999 16:29:20 +0930 From: Greg Lehey To: Wes Peters Cc: advocacy@freebsd.org Subject: Re: Data Communications Magazine article References: <370C3132.29B9E0F2@softweyr.com> <19990408151256.L2142@lemis.com> <370C3A60.5D005F12@softweyr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: <370C3A60.5D005F12@softweyr.com>; from Wes Peters on Wed, Apr 07, 1999 at 11:10:56PM -0600 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-advocacy@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Wednesday, 7 April 1999 at 23:10:56 -0600, Wes Peters wrote: > Greg Lehey wrote: >> >> On Wednesday, 7 April 1999 at 22:31:46 -0600, Wes Peters wrote: >>> *** Need to quote maximum file and filesystem sizes here. *** >> >> I don't think we can. File systems can be more than 100 GB, and you'd >> have to calculate the maximum file size. It depends on the (square >> of) the block size. > > And the largest supported block size is? You want I should know all the answers? I'm not even sure there is a maximum. Let's see... # newfs -N -b 262144 -f 32768 /dev/vinum/rsrc /dev/vinum/rsrc: 819200 sectors in 200 cylinders of 1 tracks, 4096 sectors 400.0MB in 13 cyl groups (16 c/g, 32.00MB/g, 2048 i/g) super-block backups (for fsck -b #) at: 512, 66048, 131584, 197120, 262656, 328192, 393728, 459264, 524800, 590336, 655872, 721408, 786944, # newfs -N -b 524288 -f 131072 /dev/vinum/rsrc /dev/vinum/rsrc: 819200 sectors in 200 cylinders of 1 tracks, 4096 sectors 400.0MB in 13 cyl groups (16 c/g, 32.00MB/g, 4096 i/g) super-block backups (for fsck -b #) at: Floating point exception (core dumped) Well, with 256 kB blocks the triple indirect inode pointers points to 2**42 blocks of 2**18 bytes, or a total of about 2**60 bytes. We'd really need to go to 512 kB blocks to address the entire 18 EB. But I suspect that's just a bug in newfs which we can fix when the need arises :-) >>> *** Need a good reference for Vinum here. At a minimum, we >>> can point him at http://www.lemis.com/vinum.html if OK >>> with Greg Lehey. *** >> >> What's wrong with that? Should I update it? I suppose that question >> answers itself. Anyway, you (or anybody else) are welcome to quote >> it. > > It says right on the page that it's not up-to-date. ;^) Sure. Lots of web pages do that. But I might update it before he sees it :-) Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-advocacy" in the body of the message