Why we don't need to defrag UNIX FS? Post: 302451238

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Special Forums Hardware Filesystems, Disks and Memory Why we don't need to defrag UNIX FS? Post 302451238 by methyl on Monday 6th of September 2010 06:40:28 AM

09-06-2010

Registered User

Quote:

I've seen NTFS fragment terribly when only 50% full.

Me too.
After a cleanup of a full 40 Gb NTFS drive down to 60% full I've had the M$ Windows XP defrag take 30 hours despite having 2 Gb memory fitted. After that the system ran normally.

Similarly a large unix UFS /tmp mounted partition which briefly contained 400,000 files and directories (after a programming accident) ran really slowly afterwards until re-created from scratch.

With large database systems pre-allocating the segments means that you do not have disc fragmentation but that the database engine needs to handle fragmentation.
I've seen databases left to expand dynamically which caused severe slow running due to disc fragmentation even though the database engine reported no fragmentation. A database dump/load to preallocated segments on a properly tuned filesystem cured the problem.

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LEARN ABOUT SUSE

ntfsprogs

NTFSPROGS(8)						      System Manager's Manual						      NTFSPROGS(8)

NAME

       ntfsprogs - tools for doing neat things with NTFS

OVERVIEW

       ntfsprogs is a suite of NTFS utilities based around a shared library.  The tools are available for free and come with full source code.

TOOLS

       mkntfs(8) - Create an NTFS filesystem.

       ntfscat(8) - Dump a file's content to the standard output.

       ntfsclone(8) - Efficiently clone, backup, restore or rescue NTFS.

       ntfscluster(8) - Locate the files which use the given sectors or clusters.

       ntfscmp(8) - Compare two NTFS filesystems and tell the differences.

       ntfscp(8) - Overwrite a file on an NTFS.

       ntfsfix(8) - Check and fix some common errors, clear the LogFile and make Windows perform a thorough check next time it boots.

       ntfsinfo(8) - Show information about NTFS or one of the files or directories within it.

       ntfslabel(8) - Show, or set, an NTFS filesystem's volume label.

       ntfsls(8) - List information about files in a directory residing on an NTFS.

       ntfsmount(8) - Read-write NTFS userspace driver.

       ntfsresize(8) - Resize NTFS without losing data.

       ntfsundelete(8) - Recover deleted files from NTFS.

AUTHORS

       The  tools  were  written  by  Anton  Altaparmakov, Carmelo Kintana, Cristian Klein, Erik Sornes, Giang Nguyen, Holger Ohmacht, Lode Leroy,
       Matthew J. Fanto, Per Olofsson, Richard Russon, Szabolcs Szakacsits, Yura Pakhuchiy and Yuval Fledel.

AVAILABILITY

       The ntfsprogs can be downloaded from:
       http://www.linux-ntfs.org/content/view/19/37

       These manual pages can be viewed online at:
       http://man.linux-ntfs.org/

SEE ALSO

       libntfs-gnomevfs(8)

ntfsprogs 1.13.1						    April 2006							      NTFSPROGS(8)