From owner-freebsd-questions  Wed Jun  9  0:42:44 1999
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From: Ladavac Marino <mladavac@metropolitan.at>
To: 'Unknow User' <kernel@tdnet.com.br>,
	Dan Nelson <dnelson@emsphone.com>
Cc: questions@FreeBSD.ORG
Subject: RE: block size, simple question!
Date: Wed, 9 Jun 1999 09:40:05 +0200
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> -----Original Message-----
> From:	Unknow User [SMTP:kernel@tdnet.com.br]
> Sent:	Wednesday, June 09, 1999 5:34 AM
> To:	Dan Nelson
> Cc:	questions@FreeBSD.ORG
> Subject:	Re: block size, simple question!
> 
> Dan Nelson wrote:
> > 
> > The default is 8K blocks, with 1K frags.  News spools usually are
> > formatted at 4K/512b; I have a couple of 60GB archive volumes at
> > 16K/2K. Usually fragsize is blocksize/8.
> > 
> 
> 
> Why FreeBSD does not allow me to set my FreeBSD slices 512 bytes
> blocks
> long ?
> I set my NewFS options to -b 512 -f 1024 and it returned with a status
> 1.
	[ML]  a fragment (a partial block) cannot be larger than a block
:)

> Is that possible to have this size (512 bytes) ?
	[ML]  File fragmentation would be horrendous (DOS-FAT
fragmentation sense).  If you are concerned by the space wastage on
partially filled blocks, FFS uses a number of full blocks plus a number
of block fragments at the end of the file.  Thus you get lower file
fragmentation (blocks are big and contiguous) and don't waste space at
the end of the file because more than one file tails can reside in one
in block fragments split block.

	What you seem to want is -b 2048 -f 512.

	/Marino

> Thanks a lot!
> 
> -- 
> "The box said 'Requires Windows 98, NT, Linux or better' so I
> installed FreeBSD."
> 
> 
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