Date: Thu, 01 Mar 2007 23:04:52 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-questions@freebsd.org Subject: Re: defrag Message-ID: <es7im6$9tu$1@sea.gmane.org> In-Reply-To: <20070301165055.638b0a06.wmoran@collaborativefusion.com> References: <539c60b90703010849x33dd4bbbt8f6ca6aa0c8e83a0@mail.gmail.com> <es7gv6$3is$1@sea.gmane.org> <20070301165055.638b0a06.wmoran@collaborativefusion.com>
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[-- Attachment #1 --] Bill Moran wrote: > In response to Ivan Voras <ivoras@fer.hr>: >> 352462 files, 2525857 used, 875044 free (115156 frags, 94986 blocks, >> 3.4% fragmentation) > > Just to reiterate: > "Fragmentation" on a Windows filesystem is _not_ the same as "fragmentation" > on a unix file system. They are not comparable numbers, and do not mean > the same thing. The only way to avoid fragmentation on a unix file system > is to make every file you create equal to a multiple of the block size. Ok, my point was that 3.4% is a low number for a long used system, but, for education sake, what is the difference between Windows' "fragmentation" and Unix's "fragmentation"? I believe that a "fragmented file" in common usage refers to a file which is not stored continuously on the drive - i.e. it occupies more than one continuous region. How is UFS fragmentation different than fragmentation on other kinds of file systems? UFS has cylinder groups, blocks and block fragments. Obviously, a file larger than a cylinder group will get fragmented to spill over to another cylinder group. Block fragments only occur at the end of files. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFF504EldnAQVacBcgRAoz/AKDgbH7STCc6OzVe0wFVjvg7GrTHxQCfX5St Y9QDYxZVSBpmGz19hbsJ1Tg= =VqjP -----END PGP SIGNATURE-----
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