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Full Discussion: Why we don't need to defrag UNIX FS?
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
Old 09-06-2010
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 CENTOS

ntdbtool

NTDBTOOL(8)						    System Administration tools 					       NTDBTOOL(8)

NAME

       ntdbtool - manipulate the contents NTDB files

SYNOPSIS

       ntdbtool NTDBFILE [COMMANDS...]

DESCRIPTION

       This tool is part of the samba(1) suite.

       ntdbtool a tool for displaying and altering the contents of Samba NTDB (New Trivial DataBase) files. Each of the commands listed below can
       be entered interactively or provided on the command line.

COMMANDS

       create NTDBFILE
	   Create a new database named NTDBFILE.

       open NTDBFILE
	   Open an existing database named NTDBFILE.

       erase
	   Erase the current database.

       dump
	   Dump the current database as strings.

       cdump
	   Dump the current database as connection records.

       keys
	   Dump the current database keys as strings.

       hexkeys
	   Dump the current database keys as hex values.

       info
	   Print summary information about the current database.

       insert KEY DATA
	   Insert a record into the current database.

       move KEY NTDBFILE
	   Move a record from the current database into NTDBFILE.

       store KEY DATA
	   Store (replace) a record in the current database.

       show KEY
	   Show a record by key.

       delete KEY
	   Delete a record by key.

       list
	   Print the current database hash table and free list.

       free
	   Print the current database and free list.

       ! COMMAND
	   Execute the given system command.

       first
	   Print the first record in the current database.

       next
	   Print the next record in the current database.

       check
	   Check the integrity of the current database.

       repack
	   Repack a database using a temporary file to remove fragmentation.

       quit
	   Exit ntdbtool.

SEE ALSO

       tdbtool(8)

CAVEATS

       The contents of the Samba NTDB files are private to the implementation and should not be altered with ntdbtool.

VERSION

       This man page is correct for version 4.0 of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

Samba 4.1							    06/17/2014							       NTDBTOOL(8)
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