Date: Sat, 2 Mar 2002 09:43:11 -0500 From: Brian T.Schellenberger <bts@babbleon.org> To: David Smithson <david@customfilmeffects.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: defragment UFS Message-ID: <20020302144311.A9387BA03@i8k.babbleon.org> In-Reply-To: <3C807A58.1030209@customfilmeffects.com> References: <002301c1c1a6$b9e06f70$0801a8c0@ethel> <20020302050142.GB1634@raggedclown.net> <3C807A58.1030209@customfilmeffects.com>
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On Saturday 02 March 2002 02:08 am, David Smithson wrote:
> I see. Well that's dandy. I have another filesystem-related question.
> I have a 1.2TB file server running FreeBSD. The filesystem is exported
> via SMB. When I view the properties of a SAMBA shared folder, there are
> two file sizes shown: "size" and "size on disk". The "size on disk" is
> consitently greater than the "size". I ignorantly assumed this meant
> that data was fragmented. Do you have any idea what this means?
>
> The question of data size came about when I ran a backup of a directory
> tree that is reportedly 76 GB. The Large DTF tape medium I'm using is
> supposed to hold 108 GB at it's only compression ratio of 1:2.59. I ran
> "tar -cvf /dev/sa0 /dir-tree". After some time, tar reported that it
> had reached the end of the medium. Clearly 76 GB should fit on this
> tape. I can't figure out what is happening here. Any ideas?
Just a guess, but if you have very, very many very small files, it could be
the blocksize-rounding loss. Thus if you have a file with 4 bytes of data,
and a blocksize of 1k, then you have 1020 bytes of wasted space; or, a "size"
of 4 and a "size on disk" of 1024.
>
> Thanks for your help.
>
> Cliff Sarginson wrote:
> >On Fri, Mar 01, 2002 at 08:57:16PM -0800, David Smithson wrote:
> >>Hi all. Is there a defragment utility for FreeBSD? Is it even
> >> necessary? If not, why not?
> >
> >No.
> >No.
> >No matter what size file you have on FreeBSD it will never have more
> >than one partially filled block, when a file grows it fills the spaces
> >up rather than allocating new blocks uneccesarily a la DOS.
>
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--
Brian T. Schellenberger . . . . . . . bts@wnt.sas.com (work)
Brian, the man from Babble-On . . . . bts@babbleon.org (personal)
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