Date: Thu, 08 Apr 1999 07:12:16 -0600 From: Wes Peters <wes@softweyr.com> To: Greg Lehey <grog@lemis.com> Cc: advocacy@freebsd.org Subject: Re: Data Communications Magazine article Message-ID: <370CAB30.2FA7EC05@softweyr.com> References: <370C3132.29B9E0F2@softweyr.com> <19990408151256.L2142@lemis.com> <370C3A60.5D005F12@softweyr.com> <19990408162920.P2142@lemis.com>
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Greg Lehey wrote: > > 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 :-) I think that'll do. It should certainly allay his fears about tiny filesystems. > >>> *** 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 :-) Hokay, I'll drop it in there. Already, in fact. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC http://www.softweyr.com/~softweyr wes@softweyr.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-advocacy" in the body of the message
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