Date: Thu, 8 Apr 1999 16:29:20 +0930 From: Greg Lehey <grog@lemis.com> To: Wes Peters <wes@softweyr.com> Cc: advocacy@freebsd.org Subject: Re: Data Communications Magazine article Message-ID: <19990408162920.P2142@lemis.com> In-Reply-To: <370C3A60.5D005F12@softweyr.com>; from Wes Peters on Wed, Apr 07, 1999 at 11:10:56PM -0600 References: <370C3132.29B9E0F2@softweyr.com> <19990408151256.L2142@lemis.com> <370C3A60.5D005F12@softweyr.com>
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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
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